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Yuan, Z.; Riaz, A.; Chohan, B.S. Precision Machining by Dicing Blades. Encyclopedia. Available online: https://encyclopedia.pub/entry/41480 (accessed on 19 April 2024).
Yuan Z, Riaz A, Chohan BS. Precision Machining by Dicing Blades. Encyclopedia. Available at: https://encyclopedia.pub/entry/41480. Accessed April 19, 2024.
Yuan, Zewei, Ali Riaz, Bilal Shabbir Chohan. "Precision Machining by Dicing Blades" Encyclopedia, https://encyclopedia.pub/entry/41480 (accessed April 19, 2024).
Yuan, Z., Riaz, A., & Chohan, B.S. (2023, February 21). Precision Machining by Dicing Blades. In Encyclopedia. https://encyclopedia.pub/entry/41480
Yuan, Zewei, et al. "Precision Machining by Dicing Blades." Encyclopedia. Web. 21 February, 2023.
Precision Machining by Dicing Blades
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Diamond dicing blades are profound cutting tools that find their applications in semiconductor back-end packaging and assembly processes. To fully appreciate the benefits of the dicing blade technique for precision machining, a deeper understanding is required.

dicing blades precision machining surface roughness

1. Introduction

Dicing blades extend the capabilities of the traditional semiconductor process by allowing multiple microelectromechanical devices to be mounted on a single silicon wafer. Microelectromechanical systems (MEMSs) coupled with integrated circuitry (IC), infrared (IR) filter devices, and electromechanical components necessitate the profiling of hard and brittle materials such as silicon, silicon carbide and sintered silicon carbide (SiC and SSiC, respectively), alumina, quartz glass, sapphire, and dielectric substrates [1]. These materials’ wafer slicing results in miniature structures with complex patterns and structures. After being installed in devices, these microstructures must be reliable in harsh and corrosive environments. Such structures also need to have outstanding comprehensive properties such as high strength, increased hardness and stability, and improved wear capacity in postmachining scenarios. Back-end machining separates the chips from the wafer in order to fabricate the micro components. Microcracks and cracking that result in subsurface damage during machining can appear at the sidewalls and edges. Traditional subtractive machining techniques such as laser machining [2], electrochemical machining [3], and water/abrasive water jet machining [4] generate excessive chipping and cracking, which hinder the device from working effectively. In the context of failing to meet quality standards after the machining process, researchers sought a more precise machining approach. Dicing is a common machining technique that was previously used for micro texturing difficult-to-cut materials [5][6]. The traditional dicing method restricts the development of novel MEMS devices; however, over time, dicing blades and the dicing method have developed to produce high yield and throughput by allowing designers to create novel designs.
Among dicing, various techniques were used to carry out specific processes, such as die separation in the microelectronic industry, that used separation techniques such as diamond scribing (Figure 1a), laser scribing (Figure 1b), and diamond wheel dicing (Figure 1c) [7]. Ultrasonic dicing is another method of dicing that involves the simultaneous movement of abrasive grains impregnated in saw blades that carry rotational speed, an ultrasonic vibration perpendicular to the workpiece, and feed direction movement (Figure 1d) [8][9]. Apart from that, the stealth dicing technique focuses a laser beam on the surface beneath the target wafer (Figure 1e). Despite its ability to eliminate water damage concerns, its use is constrained because of issues with rough surfaces and heavily doped wafers [10][11]. Furthermore, plasma dicing allows for the cutting of a wafer into a die via dry etching under vacuum, which employs fluorine plasma to etch away the material in the dicing lanes between the chips (Figure 1f). It is appropriate for discrete devices with narrow streets and high aspect ratios to increase the fixing capacity of each die per wafer [12][13]. Each dicing technique has unique characteristics that present particular challenges.
Figure 1. Die separation techniques: (a) diamond scribing; (b) laser scribing; (c) diamond wheel dicing; (d) ultrasonic dicing; (e) stealth dicing; (f) plasma dicing.
ICs are mostly less affected by dicing challenges, whereas MEMSs are exposed to atmospheric variables during operation, making them more vulnerable to dicing challenges. A few factors must be taken into consideration in order to fully benefit from dicing blades for MEMS devices. The first challenge is contamination; large particles can stop moving devices, while small particles can disrupt device function. The MEMS structure limits the normal passage of particles that would generally be swept away with water sprayed on it as the wafer is being diced by the dicing blade. The second issue is water pressure damage and dicing forces. Because MEMSs can withstand less stress, water pressure and dicing forces must be kept to a minimum. The third is electrostatic discharge, which occurs when transferring a wafer between stations in a dicing saw and can affect electrostatic components. Some solutions have been proposed for contamination: modify the spray nozzle to change the flow of the nozzle; for water pressure damage, cap the wafer or protect it with a thin film. For forces, use an atomizing nozzle or immerse the wafer in water; for electrostatic discharge, use deionized water and ionizers [10][11]. Due to the characteristics of the material, the distribution of abrasive grains, the bonding matrix, and cutting parameters of feed speed, depth of cut, and cooling rate, dicing blades may exhibit defects such as delamination, fiber pull out, burrs, microcracks, chipping, nonlinearity, subsurface damage, and uneven cuts. A dicing method capable of meeting profiling needs is required to reduce dicing defects and improve surface characteristics.
Among various dicing techniques, the dicing blade is chosen for this research—a well-known technique subject to its widespread use for MEMSs and ICs by providing material grooving in addition to slicing, cutting off, cross-sectioning, and slotting [13]. While the use of dicing blades is important, it should not be the only metric to consider. Dicing blade production, dicing parameters (other than machining), and optimization are all viewed as proxies for dicing blade performance evaluation.

2. Preparation Methodology of Dicing Blades

The success of the complex dicing blade production process improves the dicing quality of the cut substrate, as shown in Figure 2 [14]. It begins with a ball milling machine mixing powder metals with diamond abrasives in proportion to the component ratio of the dicing blade. After measuring the volume and density of the mixed powder, it is filled in a graphite mold while another metal mold controls the thickness of the powder spread. Before transferring the mixed powder to the graphite mold for sintering in the hot press, the flat scraper removes the redundant powder from the mold. The thinning action on the sintered dicing blade is performed by a double-side lapping machine, and the uniformity of diamond grits is validated by a microscope. DISCO, ADT, Ceiba, Shanghai Sinyang, and UKAM are some of the leading manufacturers of dicing blades in China and across the globe [15].
Figure 2. Preparation of dicing blades.
Figure 3a depicts the structure of a typical dicing blade after production; the abrasive product of the blade contains three components: abrasives, bonds, and pores [13]. Abrasives are used to process the workpiece; they can be super or standard abrasives. Meanwhile, resin, metal, vitrified, and electroformed bonds hold abrasives to produce blades for quality cuts and air pockets hold abrasives in bonds (pores). Diamonds are recommended as abrasives for machining difficult-to-cut materials because they can precisely grind the material at the nano scale. Diamonds can be used as abrasives to cut through the hardest materials that cannot be cut through by conventional abrasives, carbides, or high-speed steel. High strength, wear resistance, and hardness make diamond an ideal candidate for machining hard-to-cut materials [16]. Synthetic diamonds are used for diamond blade manufacturing of resin bond, metal bond, and electroplating. Due to its consistency in shape, hardness, and density and usefulness for specific applications, the replacement of natural diamond with synthetic diamond is a lucrative option. High pressure high temperature (HPHT) and chemical vapor deposition (CVD) are two processes that can be used to create synthetic diamonds [17][18]. Belt, cubic, and BARS presses are the diamond-growing units in HPHT. Small diamond seeds, refined graphite, and catalysts made of metals and powders are all constituents of HPHT machines’ growth cells, which, when subjected to higher temperatures and pressures, transform into molten metal solutions. The carbon atoms in the dissolving graphite then create the diamond seed’s crystal structure over time. The diamond’s form is determined by the process parameters. Contrarily, in the CVD process, a mixture of gases, including carbon, hydrogen, and oxygen, fills the chamber. After heating the substrate, the diamond seed is added to the chamber, where carbon from the gaseous mixture eventually crystallizes into diamond.
Figure 3. (a) Elements of the abrasive product in dicing blade; SEM micrograph of dicing blade fabricated from (b) SPS; (c) vacuum sintering.
The most common types of dicing blades are metal binder, resin binder [19], ceramic binder, hybrid, and electroplated nickel binder [15]; the first three can be produced using hot press sintering technology. In hot press sintering, sintering temperature and pressure ensure improved blade-cutting characteristics, and the heating process can be divided into transition, low-temperature alloy, and insulation stages. For pressure, it is gradually increased in three stages, beginning with the transition and ending with the final insulation stage [14]. Aside from hot press sintering [20], resin binder dicing blades can also be made using an ultraviolet curing technique, which turns liquid resin into solid resin [21]. The other widely used sintering methods are vacuum and spark plasma sintering (SPS) [22]; vacuum sintering prevents the flow of oxygen into the die while desorbing oxygen from powder metal. It should be mentioned that oxygen induction must be managed during the sintering process to avoid reactions brought on by the active element of carbon at higher temperatures. That could weaken the metal matrix’s strength and lessen the bonding force between the matrix and the diamond abrasive. Additionally, desorbing oxygen from the powder’s surface prohibits metal powders from oxidizing. In vacuum sintering, heating the wires with thermal radiation helps to heat the metal powder, so trying to adjust the temperature takes more time. The compound matrix is not uniform enough due to the longer time needed for the sintering process to complete [15]. Metal dicing blades made of SPS can achieve low sintering temperatures in a short period [23], ensuring that diamond abrasives are uniformly bonded to the matrix. The microstructures shown in Figure 3b are the result of an SPS process in which quick sparks occur between metal particles, resulting in metal particles that are very well merged in the matrix. In contrast, as shown in Figure 3c, a nonuniform matrix with reasonable porosity can be seen in the microstructure of the dicing blade emerging from vacuum sintering [15]. Electroplated nickel binder blades are produced by plating an ultrathin metal film on a substrate for diamond grit fixing [24].

3. Optimization of Dicing Blades

3.1. Through Truing

Truing a diamond dicing blade aids in determining spindle power consumption and mitigates chipping issues [25]. The use of trued and dressed blades for circumferential and sidewall grinding on high-hardness substrate materials such as Al2O3, Al2O3-TiC, and SSiC results in high energy consumption. High power consumption was observed for dicing SSiC due to increased sidewall wear in comparison to other materials Al2O3 and Al2O3-TiC. For dicing SiC in the presence of water, a thin polycrystalline diamond blade (PCD) trued by electrical discharge machining (Ed-trued) was used [26]. In contrast to excessive chipping with a nontrued blade, an Ed-trued blade produces sharp grooves and chip-free cutting edges, as shown in Figure 4.
Figure 4. Groove cut with thin PCD blade before and after trusion.

3.2. Through Blade Dressing

During the dicing blade preparation phase, dressing is defined as the process of removing excess bonding material by exposing sharp diamond abrasive grits for a better-quality cut. The use of dressing boards made of silicon carbide produced positive results in terms of capacity and production times, but the dressing process needs to be optimized to produce a dicing wheel topography that is positively correlated with blade profile, geometry, exposure, and cutting force [27][28]. Continuous laser dressing is possible in dicing machines by combining two capabilities: monitoring sharpness during dicing and performing laser dressing. As a result, researchers attempted to improve the performance of diamond dicing blades through laser dressing, keeping in mind that laser-dressed metal-bonded blades have high sharpness that aids in the processing of difficult-to-cut materials. Dressing on the cutting edge is accomplished by focusing the laser beam on the rotating dicing blade, and the chip space is created on the blade surface through the use of vaporization of the surrounding bonding material [28]. Dressing parameters can be adjusted to minimize the thermal influence on diamonds; dressing with a pulse duration of 12 ps provides the best dressing results by filling chip space with diamond abrasive grains to provide a maximum average roughness of Ra = 5 µm for wavelengths of 532 nm and 1064 nm, while less chip space produces a maximum average roughness of Ra = 3.41 µm for 655 ps pulse duration.
Moving from laser dressing to continuous laser dressing, where the dicing blade performs the cutting action and the abrasives wear out, laser irradiation helps to remove chips and metal binder from the blade so that the cutting process can be carried out with equal diamond protrusion, as shown in Figure 5. A pulsed laser with a pulse rate of τ = 655 ps and a wavelength of 532 nm can be used to install an on-machine laser dressing facility [29]. When compared to traditionally dressed blades, the laser-dressed blade achieved better cutting depth consistency. Investigations into the ability of nickel-bonded diamond blades to produce better results observed that the cutting depth and spindle power consumption stayed constant.
Figure 5. Principle of continuous laser dressing.
On-machine continuous laser dressing effectiveness can be assessed by monitoring spindle power and cutting depth consistency for hard and brittle materials such as aluminum oxide [1]. Since dicing wear is monitored by a power control attached to a spindle, laser-dressed blades demonstrated that blade sharpness is closely related to spindle power consumption, resulting in lower radial losses. Furthermore, dicing SSiC substrate with dressed blade produced better surface roughness, indicating that dicing blade grit size is also important as it leads to high sharpness for better kerf roughness and consistency in cutting depth [30]. In-line dressing criteria for metal-bonded diamond blades can be established; indirect analysis of cutting force measures the rotating spindle power consumption [31]. To elaborate criteria by dicing SSiC, after each cut, the cutting signal rises due to the amount of wear introduced in a specific instant of time, resulting in constant spindle speed. The dicing blade slips into the flange at point A and then sticks again, and as shown in Figure 6a, after crossing point A, the cutting quality changes. However, after dressing, the spindle’s power consumption reaches a minimum of 600 mV, as shown in point B of Figure 6b; the dressing process begins again at an 8 to 10% increase in spindle power, as shown in point C of Figure 6b; the blade then slips in the flange and sticks again (cut 3 and 4, Figure 6b). In-line detection of cutting defects can be performed, and after an 8 to 10% increase in signal, the dressing process must start to prevent further damage to the dicing blade.
Figure 6. (a) Signal analysis of five cuts before laser dressing; (b) signal analysis of five cuts after laser dressing.

3.3. Through Coating

To improve the performance of dicing blades, coating the cutting tools helps to reduce chipping levels and environmental aspects, such as less cooling water usage and less debris. Thin-film metallic glass (TFMG) coating on Si, SiC, and sapphire blades and patterned sapphire substrates (PSS) reduced chipping area by 23%, 36%, 45%, and 33%, respectively [32]. Similarly, titanium-aluminium-nitride (TiAIN) coating on nickel-bond diamond dicing blades improved hardness; the average hardness of the coated and uncoated blades measured was 0.41 Gpa and 0.1 GPa, respectively [33]. In addition to coating, BEO (1,4-bis(2-hydroxyethoxy)-2-butyne) can be added to the electrodeposition process of composite coatings during the preparation phase of dicing blades to improve hardness and wear resistance [34]. Although adding BEO to the bath helped to reduce chipping levels, coating on composite materials can help researchers find the best quality thresholds. To achieve composite coating on the dicing blades, a suspension and high–low speed interval agitation method was proposed [35]. According to the method’s findings, diamond concentration plays an important role in quality, so low grit sizes are recommended. Additionally, the diamond concentration was found to have a direct relationship with the suspended content and an inverse relationship with the stirring speed.

3.4. Through Adding Resin

Dicing blades commonly experience breakage; the strength can be increased by immersing the whisker in resin, which acts as a bonding material [36]. Apart from helping to strengthen the dicing blades, the light-sensitive resin has an instant solidifying process that uses less pollution and energy. The whisker in the resin greatly influences the mechanical properties of the light-sensitive resin. As a result, tensile strength increases with whisker quantity up to 15% by volume and then begins to decline. When a nonwhisker blade is compared to a whisker-added blade, the former ruptures after the dicing process, whereas the latter shows normal wear throughout. Furthermore, replacing thermosetting resin with photopolymerizable resin in the production of structure-controlled blades such as sandwich-structured, three-layer-structured, and slot-structured dicing blades improves machinability and lowers production costs [37]. Photopolymerizable resins with a slot-shaped mask that irradiates the resin with ultraviolet light can be used to create slot-structured blades. Three-layer blades improved in mechanical properties, while the grinding ratio and spindle motor improved as the number of slots increased. However, one disadvantage of using a slotted blade is that the chip size is larger because the workpiece, in this case, contacts more frequently due to the slots.

3.5. Through PCD Blade

PCD blades proved advantageous in the ductile-mode dicing process for resolving surface and chipping issues [38]. The fabrication of a PCD blade can be accomplished by tangentially irradiating the cutting edge of the rake and flank faces with pulsed laser light. Because of the PCD blade’s high stiffness and hardness, a surface with zero cracks and chipping emerged while undergoing full-cut conditions at high rotational speed; it also managed to cut a thick SiC substrate in one go while avoiding burr formation [39]. The developed PCD blade takes advantage of the feature of cutting in a straight line without buckling deformation in cemented carbide; ultrafine grooves with high aspect ratios of 50 were formed, i.e., 20 µm in width and 1 mm in depth, as shown in Figure 7. Due to the presence of distributed edges around abrasive particles, conventional blades are unable to produce such fine grooving; on the other hand, PCD blades have an agglomerated structure of uniform cutting edges for crack-free machining of the substrate.
Figure 7. Fine grooving of cemented carbide (groove depth 1 mm, width 20 μm, and length 8 mm): (a) top view of deep grooves; (b) cross-sectional view of deep grooves.

3.6. Through Dual Dicing

Figure 8a depicts the thickness of the spacer between two dicing blades and the diamond protrusion, which determines the size of the structure and helps to prevent excessive chipping and larger angles of the cutting groove sidewall [40]. Metal-bonded blades produced 20% less chipping than single dicing by using dual dicing on a stack of materials: anodically bonded silicon carbide, monocrystalline silicon, and borosilicate glass. Furthermore, when compared to a single blade, the outer sidewalls of the cutting groove with a dual blade gave smaller angles of less than one degree, as shown in Figure 8b,c. Although the dual dicing concept can produce microstructures with high aspect ratios, there are limitations regarding the chipping value, which must be less than 10% of the total thickness to prevent rupture. As a result, the impact of dicing blade protrusion requires better understanding. A double-pass sawing method, similar to dual dicing, was proposed to reduce chipping and cracking in silicon wafers laminated with conductive die attach film (DAF) [41]. Even though conductive laminated wafers frequently exhibit extreme chipping, the method found that dicing less than 30% of the DAF material resulted in less chipping.
Figure 8. (a) Concept of dual dicing; silicon dicing results comparing single and dual dicing for (b) chipping (c) sidewall angles.

4. Material Removal Mechanism of Dicing Blades

In addition to the primary removal mechanism, a few recommendations in the literature for improving the material removal process provide a clear understanding of the cutting mechanism via dicing blades. The dicing blade material removal process varies based on the morphology of the workpiece. To begin with carbon-fiber-reinforced plastic (CFRP) composites, plastic flow in the local regions of fibers and resins, along with micro breakage, was identified as the primary material removal mechanism. Furthermore, macroscopic and microscopic simulations are suggested for gaining a better understanding of the CFRP composite cutting mechanism [42]. Likewise, plastic flow is responsible for cutting in the grinding of brittle materials [43]. For composite materials, the material removal process changes as the fiber orientations change, as shown in Figure 9b–f. If the dicing direction is parallel to the fiber orientation, the scratching action takes advantage of improper fiber embedding in the matrix [42]. A perpendicular dicing direction to fiber orientation, on the other hand, proceeds the cutting action with a diamond grit tip owing to the small cutting depth and proper fixation of carbon fibers in the matrix, resulting in a smooth surface finish. Dicing at an angle causes visible fiber breakage due to delicate support and extreme cutting force applied by diamond grits. For the cutting process with silicon, three material removal steps are responsible: rubbing, plastic deformation, and cracking, whereas for alumina, intergranular and transgranular mechanisms play a role [44].
Figure 9. Surface morphology of AFRP composites after dicing: (a) morphology of the groove side; (b) schematic diagram of dicing mechanism with different fiber orientations for CFRP composites; (c) dicing direction parallel to fiber orientation; (d) dicing direction perpendicular to fiber orientation; (e) dicing direction with an angle of 45° to fiber orientation; (f) dicing direction with an angle of 135° to fiber orientation.
Numerical simulations for sapphire substrates revealed that the plowing action caused by the grinding particles and sinter was a significant factor in material removal. Figure 9a depicts the side topography of the cutting groove in aramid fiber-reinforced plastic (AFRP) composites; due to the higher toughness of aramid fibers, peeling instead of cutting results in a small number of burrs on the cutting groove edges [45]. The cutting mechanism of AFRP composites can be improved by using abrasive particles with cutting edges smaller than the diameter of the aramid fibers, which reduces damages caused by tool size and corresponding cutting speed.

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