Diamond coating silicon nitride ceramic integral cutter, preparation method thereof and application of cutter in graphite

Abstract

The invention provides a diamond coating silicon nitride ceramic integral cutter, a preparation method thereof and an application of the cutter in graphite, and relates to the field of ceramic cutters. The cutter is composed of a silicon nitride ceramic substrate and a diamond film coating, the diamond film coating coats the surface of the silicon nitride ceramic substrate, the thickness of the diamond film coating is 7 um-12 um. Due to the fact that a chemical vapor deposition (CVD) diamond film has excellent chemical and physical properties and has extremely high hardness, excellent wear resistance and chemical stability, the CVD diamond film can be widely applied to various cutters. The method combines the advantages of a coating material and a silicon nitride ceramic cutting tool basebody, the coating cutter has good cutting performance, high hardness, wear resistance, low thermal expansion coefficient and the like, and the abrasion resistance and the service life of the cutter are improved.

Description

technical field [0001] The invention relates to the field of ceramic cutters, in particular to a diamond-coated silicon nitride ceramic integral cutter, a preparation method thereof, and an application of the cutter in graphite. Background technique [0002] Ceramic cutting tools are widely used in high-speed dry machining of various hard and brittle materials due to their excellent chemical stability and good mechanical properties. Currently, silicon nitride (Si 3 N 4 ) are widely used in ceramic tool materials, where Si 3 N 4 The tool has the characteristics of high strength, good fracture toughness, less crack initiation, and low cost, but it has high wear rate and short tool life, especially for cutting hardened steel and cold brittle cast iron, which limits the Si 3 N 4 Tool promotion and application. [0003] Chemical vapor deposition (CVD) diamond films are widely used in various cutting tools due to their excellent chemical and physical properties, extremely hi...

AI Technical Summary

Problems solved by technology

However, when brittle graphite is processed at high speed, it is easy to break, break and deform, has low processing accuracy and severe tool wear, which is the bottleneck of the development of design and manufacturing technology in the graphite mold industry. There are very few domestic literatures that mention the reasons for analysis and solutions.

Aiming at the problems of low yield rate, high processing and manufacturing cost and difficult quality assurance of 3D glass hot-bending graphite molds in the industry

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