Tungsten Carbide Anvil Wear Mechanism (1/2)

Tungsten carbide anvil consists of hard phase WC and binder phase Co, which has higher density, higher hardness, excellent wear resistance and corrosion resistance. It plays an important role in some super-hard materials machining process, such as synthetic diamond, CBN (Cubic Boron Nitride) and so on. The service life of tungsten carbide anvil will affect synthetic diamond properties and overall machining efficiency directly. In general, there are two kinds of evaluation criteria of tungsten carbide anvil quality, one is the frequency of use, and the other is ten thousand karats consumption.

Actually, tungsten carbide grades used in anvil usually YG6, YG8, YG12, etc. And compared with the powder with medium grain, the fine grain will remarkably improve the hardness, compressive stress, flexural strength, impact toughness and other properties. Sintered tungsten carbide anvil with medium grain service life is about 5,000 times ten thousand karats consumption> 3kg; compared with tungsten carbide anvil with fine grain hardness generally reach more than HRA90.5, bending strength of 3000MPa, the average service life is more than 8,000 times, ten thousand karats consumption <1.5kg.

Domestic synthetic diamond industry mainly is based on hexa-orientation, and six anvil compacts the six face simultaneously. Each anvil is composed by the hammer, steel ring and pad. It works through the steel ring interference fit with the hammer, a steel ring on the anvil to impose certain radial preload in six hydraulic cylinders driven, six tungsten carbide anvils are acting on the high-pressure cavity composed by pyrophyllite hexahedron, which change the graphite inside the cavity into diamond by the catalytic effect under high temperature and pressure. Pyrophyllite is a hydrous aluminum silicate layered structure, in the process of synthesis plays role in pressure transmission, sealing and insulation effect.

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