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The super hard cutting tool is a higher requirement for the processing of modern engineering materials in terms of hardness, which has been developed in the last 40 years, and has been developed in the last years. Super hard material chemical composition and form different hardness of rules and other tool materials and cubic boron nitride is non metal borides, crystal structure for face centered cubic; and diamond by changing of carbon element and, the crystal structure of cubic boron nitride and similar. Their hardness is much higher than other substances.
Super hard cutting tool
High speed steel, hard alloy, ceramic and carbide, nitride and oxide are the main components of modern cutting tool materials. For example, high-speed steel is joined the iron carbide alloy composition (W, Mo); hard alloy is mainly carbides, nitrides and carbonitrides: ceramic oxides and nitrides. The hardness of these compounds is up to 3000HV, and the total hardness of the bonded material is below 2000HV. For the processing of modern engineering materials, in some cases, the hardness of the tool material is not enough to use, Yu Shichao hard cutting tool materials will emerge as the times require, in twentieth Century after 40 years with a greater development. Super hard material chemical composition and form different hardness of rules and other tool materials and cubic boron nitride is non metal borides, crystal structure for face centered cubic; and diamond by changing of carbon element and, the crystal structure of cubic boron nitride and similar. Their hardness is much higher than other substances. In thousands of years ago, humans have discovered and used natural diamond; while the manufacture and application of artificial diamond is the last century. Boron nitride is artificial. In the late twentieth Century, two kinds of super hard materials, synthetic diamond and cubic boron nitride, have been developed rapidly.
Synthetic diamond in the past more than high temperature, high pressure (hot pressing method) under the conditions of the formation, called PCD, and later appeared in other manufacturing methods. PCD synthetic diamond research began in 1954, the United States in 1940 formally announced the successful development of such a diamond, industrial production began in 1957. Sweden in 1953 declared a success in 1962 to start industrial production. By 1969, the world's synthetic diamond production was 40 million carat, when the natural diamond yield was 44 million. China declared PCD manufacturing success in 1963. In 1996, the output of synthetic diamond in China was up to the total output of 6 to. At the end of the 90's, China's annual output reached 500 million, ranking first in the world. The largest Foreign Company with an annual production of synthetic diamond in recent years also reached more than 100 million.
In 1957, the United States GE company from CBN (cubic boron nitride) single crystal powder, the early 70's, PCBN tool made of polycrystalline diamond. 1972, the Soviet Union also made PCBN tool. In 1966, China successfully developed single crystal CBN. Later, made PCBN.
In recent years, the chemical vapor deposition (CVD) method to make the diamond.
Types of super hard cutting tool materials
Super hard cutting tool materials, especially diamond, many kinds of.
Cubic boron nitride CBN single product powder, used to make tools and PCBN glomerocryst tablets and PCBN glomerocryst composite sheet, used to make knives and other tools. Cubic boron nitride is artificial.
Diamond sub natural diamond (ND) and synthetic diamond. Artificial diamond PCD in single crystal powder, used for the production of abrasives; PCD single grain, tools to do; PCD polycrystalline films and polycrystalline composite sheet, used to make knives and other tools; CVD diamond thin film and thick film can be used for the production of tools, and as optical and electronic high-tech materials.
Manufacturing method of super hard cutting tool material
There are many methods for making artificial super hard cutting tool materials, which are mainly introduced in this paper.
The equipment used for the manufacture of diamond and cubic boron nitride by hot pressing method is a hydraulic machine with six top or double face. Suppression of single crystal superhard material. The raw material is arranged in the cavity. Suppress PCD crystal powder raw materials is a graphite sheet, graphite film and catalyst agent Ni Mn film lamination is arranged in the cavity; pressing polycrystalline materials PCD crystal powder, binders Ni, Si, Co; suppression of CBN single crystal powder raw material for hexagonal boron nitride (hBN) powder; pressing PCBN glomerocryst piece of raw materials for the CBN powder, and were placed catalytic agent and the binder.
Pressure in the process of pressure and boost, final pressure vary, pyrophyllite cavity pressure and top hammer pressure is not the same. Temperature is the temperature of the cavity. Time is the sum of heating time, holding time and cooling time, for all kinds of press, these parameters will be different, the data presented in this paper is just a rough figure. PCD, similar to the hot press method, and the "explosion", in the container using explosives to produce high temperature and high pressure, while the graphite into diamond. Explosion process and product quality are not easy to control, it is rarely used.
CVD method is a kind of vapor deposition method. Belongs to the working principle in the non diamond substrates of diamond deposition methods, such as "hot filament chemical vapor deposition method", "electronic enhanced CVD method, microwave PCVD method" and "RF PCVD method", "DC PCVD method, DC arc discharge PCVD method", "DC plasma jet CVD method, electron cyclotron resonance PCVD method" and "flame combustion method", excimer laser CVD method ". "CVD hot wire method" is the most commonly used.
The raw material for ethanol (alcohol), hydrogen and methane, wire for Ta wire or wire W. Heated to from 2000 to 2500 degrees high temperature hot wire and between the wire and the base of the applied voltage and the formation of plasma, make hydrogen molecules containing carbon gas dissociation, atomic hydrogen formation and capable of forming SP3 bond hydrocarbon groups. The group undergoes adsorption on the surface of the substrate at an appropriate temperature under the action of atomic hydrogen,
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