What is a super hard tool
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- Time of issue:2021-08-27 09:57
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(Summary description)Superhard cutting tools came into being because of the higher requirements for hardness in the processing of modern engineering materials, and there was a great development in the last 40 years of the 20th century. The chemical composition of superhard materials and the law of forming hardness are different from other tool materials. Cubic boron nitride is a non-metallic boride and its crystal structure is a face-centered cube; while diamond is transformed from carbon, its crystal structure is similar to that of cubic nitrogen. Similar to boron. Their hardness is much higher than other substances.
What is a super hard tool
(Summary description)Superhard cutting tools came into being because of the higher requirements for hardness in the processing of modern engineering materials, and there was a great development in the last 40 years of the 20th century. The chemical composition of superhard materials and the law of forming hardness are different from other tool materials. Cubic boron nitride is a non-metallic boride and its crystal structure is a face-centered cube; while diamond is transformed from carbon, its crystal structure is similar to that of cubic nitrogen. Similar to boron. Their hardness is much higher than other substances.
- Categories:Corporate News
- Author:
- Origin:
- Time of issue:2021-08-27 09:57
- Views:
Superhard cutting tools came into being because of the higher requirements for hardness in the processing of modern engineering materials, and there was a great development in the last 40 years of the 20th century. The chemical composition of superhard materials and the law of forming hardness are different from other tool materials. Cubic boron nitride is a non-metallic boride and its crystal structure is a face-centered cube; while diamond is transformed from carbon, its crystal structure is similar to that of cubic nitrogen. Similar to boron. Their hardness is much higher than other substances.
The main hard components of modern tool materials, high-speed steel, cemented carbide, and ceramics are carbides, nitrides, and oxides. For example, high-speed steel is iron carbide with alloy components (W, Mo, etc.) added; hard alloys are mainly carbides, nitrides and carbonitrides; ceramics are oxides and nitrides. The hardness of these compounds is up to 3000HV, and the overall hardness of the bonding material is below 2000HV. For the processing of modern engineering materials, in some cases, the hardness of the above-mentioned tool materials is no longer sufficient, so super-hard tool materials came into being. Thousands of years ago, mankind has discovered and used natural diamonds; and the manufacture and application of synthetic diamonds was in the last century. Boron nitride is man-made. In the late 20th century, two superhard materials, synthetic diamond and cubic boron nitride, developed by leaps and bounds.
Synthetic diamonds were mostly formed under high temperature and high pressure (hot pressing) conditions in the past, called PCD, and later other manufacturing methods appeared. The research on PCD synthetic diamond began in 1940. In 1954, the United States officially announced the success of the development of this type of diamond, and industrial production began in 1957. Sweden declared success in 1953 and began industrial production in 1962. By 1969, the production of synthetic diamonds was 40 million carats (carat); at that time, the annual production of natural diamonds was 44 million carats. In 1963, China announced the success of PCD manufacturing. In 1996, China's synthetic diamond output reached 240 million carats and exported 60 to 85 million carats. At the end of the 1990s, China's annual output reached 500 million carats. The largest foreign company's annual production of synthetic diamonds has reached more than 100 million carats in recent years.
In 1957, the American GE company pressed CBN (cubic boron nitride) single crystal powder, and in the early 1970s, it made polycrystalline PCBN tools. In 1972, the Soviet Union also made PCBN knives. In 1966, China successfully developed single crystal CBN. Later, PCBN is made.
In recent years, synthetic diamonds have been made by chemical vapor deposition (CVD).
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