Method for connecting superhard materials by silicification of phenolic resin

Abstract

The invention discloses a method for connecting a superhard material by a phenolic resin silicification method. The method comprises the following steps of adding 2-40% by mass of phenolic resin into the superhard material, carrying out mixing, carrying out molding or extrusion forming, carrying out drying at a temperature of 30-200 DEG C to obtain a blank material, transferring the blank material into a vacuum sintering furnace paved with silicon powder, wherein the mass of the silicon powder is 1-30% that of the superhard material, carrying out sintering at a temperature of 1450-1750 DEG C for 0.2-2h so that a silicification reaction occurs, keeping the temperature of 1550-1850 DEG C for 0.2-1.5h, and carrying out vacuum removal of redundant silicon so that the superhard material is obtained. The method realizes connection of the superhard material by the phenolic resin silicification method. According to the method, a mixture of phenolic resin and graphite or petroleum coke is used as a binder for forming of superhard material particles, the superhard material particles are subjected to silicification in vacuum to form a silicon carbide phase so that superhard material firm-bonding is realized and thus the superhard material product having bending strength of 350-550MPa is obtained.

Description

technical field [0001] The invention relates to a method for connecting superhard materials by silicification of phenolic resin, and to the technical field of improving the connection strength and applicable temperature of superhard materials. Background technique [0002] General superhard materials refer to artificial diamond and artificial CBN. The simultaneous existence of these two materials plays a complementary role and can cover the processing of various new materials developed at present and in the future, which is extremely beneficial to the entire field of cutting processing. Natural single crystal diamond is the hardest substance in the world, so its performance as an abrasive and cutting tool is unparalleled. Take the diamond turning tool as an example, the radius of its cutting edge can be sharpened to the point that even scanning electron microscope, SEM, and It cannot be detected, and until now there is no material that can replace it. Using it for cutting a...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing superhard material metal binder, which has low bonding strength and cannot be applied to high-temperature environments, and provides a binder that uses a mixture of phenolic resin and graphite or petroleum coke to form silicon carbide through silicification. Phase, method to achieve strong bonding of superhard materials