Aqueous grinding fluid applied to super precision grinding of hard and brittle materials and application method thereof

Abstract

The invention discloses an aqueous grinding fluid applied to super precision grinding of hard and brittle materials and an application method thereof. The grinding liquid contains chelant 0.1-5, a pH value regulator 5-15, a suspending agent 0.2-5, a dispersion stabilizer 0.5-10, a lubricant 5-20, an antirusting agent 0.5-5, fungicide 0-2, a defoamer 0-2 and deionized water compensating the balance of total amount of 100 parts. Under an alkali condition, the aqueous grinding fluid applied to super precision grinding of hard and brittle materials is beneficial for grinding materials with various sizes, has good suspension property and dispersion stability; when the aqueous grinding fluid is used for super precision grinding of various different hard and brittle materials, especially high-hardness materials, scratches, etching pits and other defects are not produced easily; and the grinding speed is high, the subsequent cleaning is convenient; and the aqueous grinding fluid has excellent lubricating property and antirusting property when in matched use with the grinding materials, and the mixing liquid is uniform in color and has no sediment in 48 h. When the aqueous grinding fluid is used for grinding a wafer on a grinding machine, the ground wafer is subjected to water-added ultrasonic washing, and the wafer has good surface smooth finish, no scales, etching pits and other defects, and the surface roughness can be within 2 microns.

Description

technical field [0001] The invention relates to a lubricating cooling liquid for mechanical processing and a using method thereof, in particular to an aqueous grinding liquid used for ultrafine grinding of hard and brittle materials and a using method thereof. Background technique [0002] Hard and brittle materials refer to materials with high hardness and high brittleness, such as gemstones, monocrystalline silicon, polycrystalline silicon, quartz, germanium, gallium arsenide or gallium nitride, etc. These materials are widely used in solar photovoltaics, semiconductors and other electronic and optical industry. After the hard and brittle material is cut into wafers, in order to remove the slicing marks and unevenness on the wafer surface, effectively improve the wafer surface quality and achieve the specified wafer thickness, the wafer surface is ground. [0003] In the grinding process, the grinding fluid plays a vital role. In the prior art, for grinding and processin...

AI Technical Summary

Problems solved by technology

But its price is very expensive and needs to be imported, which greatly increases the processing cost

[0006] To sum up, there are still some problems in the grinding liquid of the prior art, mainly including: poor suspension and dispersion ability; when standing for a long time, water separation and precipitation are prone to occur; subsequent cleaning is difficult, etc.