氟化钙对单晶硅片磨削用树脂结合剂金刚石砂轮磨削性能的影响

在单晶硅片磨削用树脂结合剂金刚石砂轮中分别添加不同体积分数的固体润滑剂氟化钙(CaF₂)，评估其对砂轮表面结构、砂轮磨损量、磨床主轴电流的影响，并测量和计算单晶硅片的表面粗糙度和表面损伤层厚度。结果显示:随CaF₂用量增加，磨床主轴电流、砂轮磨损量、单晶硅片的表面粗糙度值和表面损伤层厚度均下降；当CaF₂体积分数为25%时，主轴电流降至约6.4 A，砂轮磨损量降到每片0.448 6 μm，单晶硅片的表面粗糙度R_a、R_y和R_z分别为0.056 μm、0.382 μm和0.396 μm，表面损伤层厚0.559 6 μm。加入CaF₂固体润滑剂可有效改善树脂金刚石砂轮的性能，提高单晶硅片表面的加工质量，且CaF₂体积分数为25%时效果最佳。 

Effect of calcium fluoride on grinding performance of resin-bonded diamondgrinding wheel for silicon wafer

Solid lubricant Calcium fluoride (CaF₂) with different volume fractions is added into resin-bonded diamond wheels for single crystal silicon wafer grinding. Its influence on surface structure and wear ratio of the wheel, as well as the spindle current of grinding machine, is analyzed. The surface roughness of the wafer and the thickness of damage layer on its surface are measured and calculated. Results show that as the content of CaF₂ increases, the current, the wear ratio and the surface roughness and damage layer thickness all decrease. When the volume fraction of CaF₂ added is 25%, the current is about 6.4 A, and wear ratio of wheel decreased to 0.448 6 μm, with R_a 0.056 μm, R_y 0.382 μm and R_z 0.396 μm on the wafer surface and thickness of damage layer0.559 6μm. In conclusion, the performance of resin-bonded diamond wheels and the quality of machined single crystal silicon wafer could be enhanced by adding CaF₂ as solid lubricant, and the best volume fraction of CaF₂ is 25%.