Tungsten Carbide Anvil Description (1/2)

Diamond is a kind of the hardest mineral consists of pure carbon in nature. It has many advantages, such as higher hardness, excellent wear resistance, which can be widely used in cutting, grinding and drilling industries. Early in the 18th century people began the study of synthetic diamond, but until the last century was able to achieve the preparation of artificial diamond precedent. Tungsten carbide anvil is a key component of the production of synthetic diamond, and it should withstand the alternating loads of high temperature and high pressure, whose life span will directly determines the cost of diamond synthesis production.

So it has higher requirements to tungsten carbide anvil properties: 1. high hardness and compression properties (HRA ＞85, above 5000MPa); 2. high strength and toughness (tungsten carbide anvil beveled at work entails considerably greater tensile stress> 35kg / mm2); 3. excellent heat resistance, wear resistance and corrosion resistance (in the process of synthetic diamond, the transition temperature of C element is about 2000℃, and the added catalyst is not only beneficial for the synthesis, but also not react with the anvil).

Tungsten carbide grades suitable for anvil include YG6, YG8, YG12x and so on. YG6 tungsten carbide is composed of 94% WC + 6% Co, mainly based on WC powder and Co powder with medium grains. Higher hard phase WC content to ensure the compression performance of tungsten carbide anvil. But the lower content of the binder phase Co will affect the tensile strength of the anvil, which will be easily cracked in the process of synthesis diamond. Furthermore, tungsten carbide YG6 anvil has some difficulties in the content of C controlling, which prone to appear free C or η phase and affect the properties of the anvil; YG8 tungsten carbide with medium grain consist of 92% WC and 8% Co, which is not only has excellent compression performance, but also has excellent tensile strength and longer service life, so fewer cracks occur in the early stage; YG12x tungsten carbide is a kind of alloy with fine grains. Under certain circumstances of Co content, the finer granularity of WC, correspondingly the density, the hardness, the compression performance and other composite properties will be remarkably improved. Therefore, refining the grain is a kind of ideal process of tungsten carbide anvil.

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