SMART CUT® Diamond Backgrinding Wheels are designed for precision thinning and flattening of silicon wafers, glass, and ceramic substrates. These high-performance wheels are used on backgrinding machines, including models from Disco, Okamoto, Strasbaugh, and other leading manufacturers. Available in sizes ranging from 8” to 14” O.D., they are engineered to handle a wide range of materials and applications, from semiconductor wafers to microelectronic packages.
These wheels are available in various bond types to suit different needs, including:
Each bond type is customizable to meet the specific requirements of your application and material, ensuring optimal performance. By utilizing SMART CUT® Diamond Backgrinding Wheels, you can achieve:
SMART CUT® Diamond Backgrinding Wheels are customizable to fit your specific needs. Common specifications include:
The available grit sizes typically range from coarse (around 60 grit) to ultra-fine (above 3000 grit), depending on the specific requirements of the grinding process.
The grit size choice depends on the desired surface finish and material removal rate. Coarser grits remove material faster but leave a rougher finish, while finer grits give a smoother finish but work more slowly.
Lifespan varies based on usage, the material being ground, and the wheel’s specifications. However, due to the hardness of diamond, these wheels generally have a longer lifespan compared to conventional abrasive wheels.
Store in a cool, dry place away from direct sunlight. Avoid storing under conditions of high humidity or drastic temperature changes.
Yes, diamond grinding wheels can be used for other materials like sapphire, gallium arsenide, and other compound semiconductors. However, the grinding parameters might need adjustments.
Ensure proper wheel dressing, maintain consistent grinding pressure, and use appropriate coolants to prevent thermal damage.
Common bond materials include resin, metal, vitrified, and electroplated. The choice of bond affects the wheel’s wear rate, heat dissipation, and grinding performance.
Resin bonds offer good flexibility and are suitable for fine grinding. Metal bonds are durable and used for rough grinding. Vitrified bonds have good form retention, and electroplated bonds offer precision.
RPM recommendations vary based on the wheel’s diameter, material being processed, and the desired finish. Always refer to the manufacturer’s guidelines.
Yes, especially wheels with vitrified and metal bonds. Redressing restores the wheel’s surface, typically using a dressing tool or stick.
Higher diamond concentrations offer longer wheel life but might result in higher grinding temperatures. Lower concentrations provide faster material removal but may wear out the wheel faster.
Always wear safety glasses, use guards on grinding machinery, and ensure proper ventilation. Also, avoid forcing the wheel onto the material; let the abrasive do the work.
Water-based coolants are commonly used. They dissipate heat effectively and prevent dust buildup.
Regular wheel dressing, consistent grinding parameters, and using a wheel with appropriate specifications for the job can help achieve this.
Yes, many diamond back grinding wheels are designed to integrate seamlessly with automated grinding systems.
While diamond grinding wheels might have a higher initial cost, their longer lifespan and efficiency can make them more cost-effective in the long run.
Yes, many manufacturers offer custom solutions tailored to specific applications or requirements.
While CMP offers exceptional surface finishes, diamond grinding is generally faster and can be more cost-effective for bulk material removal.
Used grinding wheels, especially those with specific bond materials, may have disposal guidelines. It’s best to consult with the manufacturer or local regulations.
Lead times vary by manufacturer and order volume. It’s best to check directly with suppliers.
Tab Content
|
Type |
Profile sketch |
Common Specifications in mm |
||
|---|---|---|---|---|
|
Diameter D |
Thickness T |
Inside Diameter |
||
|
6A2 |
|
175 200 350 |
30-35 35 45 |
Inside Diameter 76 127 |
|
6A2T |
|
195 280 350 |
22.5-25 30 35 |
170 228.6 235 |
|
6A2T (three ellipses) |
|
209 |
22.5-23 |
158 |
All Dimensions: T, E, W, X can be customized to fit your requirements
Semiconductor wafers are routinely thinned prior to dicing to aid the sawing operation and to allow the final assembled package thickness to be minimized. For semiconductor devices required to operate at high power levels, wafer thinning improves the ability to dissipate heat by lowering the thermal resistance of die. As final thickness is decreased, the wafer progressively becomes less able to support its own weight and to resist the stresses generated by post backgrinding processes. Thus, it is important to reduce the damage caused by backgrinding.
UKAM Industrial Superhard Tools has the technology and expertise to help you optimize your backgrinding process to ultimate level of efficiency.
Back grinding is a crucial process in semiconductor manufacturing, aimed at thinning silicon wafers after circuits have been constructed on their front side. This step is essential for reducing the thickness of wafers, improving heat dissipation, and enhancing flexibility for various packaging applications, especially in high-performance electronics where efficient heat management and compact packaging are vital.
The process starts by mounting the wafers on a special adhesive film that secures them during grinding. This is crucial as it prevents any damage or breakage that could occur due to the thinning process. The primary tool used for back grinding is a grinding wheel made of a diamond-bonded matrix, which is capable of grinding silicon quickly and with precision. This grinding must be carefully controlled to reach the desired wafer thickness, often less than 100 microns for some applications.
During grinding, a cooling fluid is often used to prevent excessive heat build-up which could damage the wafer's surface and the underlying circuits. The fluid also assists in removing the silicon particles that are ground off. An excellent solution for this application is our
After grinding, the wafers may undergo a stress relief process, such as etching or applying a stress-relief layer, to remove any micro-cracks or surface stresses induced by the grinding.
One of the main challenges of back grinding is maintaining the integrity of the wafer surface. The process must be precise enough to thin the wafer without causing surface damage that could impair the functionality of the circuits. Handling and cleaning the wafers post-grinding are also critical, as any residual stress or particles left on the wafer can affect subsequent processes or the final performance of the semiconductor device. Additionally, the grinding process can introduce sub-surface damage, such as micro-cracks and dislocations, which might not be visible but can affect the reliability and performance of the semiconductor devices. To address these issues, advanced techniques like dry polishing or chemical mechanical polishing (CMP) are often employed after back grinding to remove or reduce such damage.
This case study demonstrates the performance of SMART CUT® Diamond Grinding Wheels in a backgrinding application for 8" and 12" silicon wafers. One of our client conducted a trial comparing the performance of SMART CUT® grinding wheels against a competitor’s wheels, utilizing different bond types and machinery.
|
Specification |
Diamond Bond 4000 |
Diamond Bond 6000 |
|---|---|---|
|
Machine Used |
DISCO_850 |
DISCO_850 |
|
Current (A) |
6.5 – 8.5 |
7.5 – 9.5 |
|
Tip Wear (um) |
0.6 – 2.0 |
0.4 – 1.5 |
|
Surface Roughness (Ra, um) |
0.022 |
0.015 |
The SMART CUT® Diamond Bond 4000 grinding wheel delivered a consistent material removal rate (MRR) with minimal tip wear and a surface roughness of 0.022 µm. The competitor’s product, on the other hand, showed higher tip wear and a higher surface roughness of 0.025 µm, indicating a higher rate of wear and less efficient grinding.
|
Specification |
Diamond Bond 4000 |
|---|---|
|
Machine Used |
DISCO_8560 |
|
Current (A) |
7.0 – 9.0 |
|
Tip Wear (um) |
0.5 – 2.0 |
|
Surface Roughness (Ra, um) |
0.020 |
For the 12" wafers, the SMART CUT® Diamond Bond 4000 grinding wheel showed exceptional durability with lower tip wear, ensuring the wafer's surface remained consistent. The surface roughness was 0.020 µm, which is optimal for high-performance applications requiring precision. The competitor’s wheel demonstrated significantly higher wear rates and slightly higher roughness values, which could potentially impact the wafer’s final quality.
|
Specification |
XRP |
Competitor |
|---|---|---|
|
Machine Used |
DISCO_840 |
DISCO_850 |
|
Current (A) |
5.5 – 7.0 |
5.0 – 6.5 |
|
Tip Wear (um) |
0.3 – 0.8 |
0.9 |
|
Surface Roughness (Ra, um) |
0.010 |
0.015 |
SMART CUT® wheels outperformed the competitor's wheels with reduced tip wear and lower surface roughness. The competitor's wheels resulted in a rougher surface with significantly more wear. The XRP bond on the SMART CUT® wheels further ensured lower power consumption during grinding, increasing overall efficiency.
SMART CUT® Diamond Grinding Wheels for silicon wafer processing delivered superior performance compared to a leading competitor's products. These wheels provided efficient material removal, minimal tip wear, and lower surface roughness, making them ideal for high-precision applications in semiconductor manufacturing. The results demonstrate the wheels long-lasting performance and high productivity, offering a significant return on investment for companies in the wafer grinding industry.
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