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       Diamond drill quality indicators are hardness, wear resistance, impact toughness, bending strength and tire linear expansion coefficient, in addition, there are carcass density, carcass thermal properties and inclusions in diamond and so on. Carcass density actually reflects the hardness and wear resistance of the carcass; the thermal properties of the carcass are related to its linear expansion coefficient; while the index of diamond-clad diamond is important, it is difficult to detect with the instrument. In these carcass performance indicators, hardness and wear resistance is the most important indicator, related to the drill on the rock adaptability and drilling efficiency. The carcass performance of the hot-pressed diamond bit is mainly determined by the carcass material and the hot-pressing process, in which the former is the main aspect of the contradiction. Deep drilling on the diamond drill bit diamond drill bit carcass performance of the basic requirements are as follows:

(1) to have sufficient compression, impact strength and hardness, and the hardness of the carcass and rock to adapt;

(2) the diamond has a good wetting, can be a strong package of diamond inlay, but also has a certain chemical stability, at high temperatures do not react with the diamond;

(3) lower melting point, the thermal corrosion of diamond is small;

(4) the linear expansion coefficient of the carcass and diamond as close as possible to reduce the impact of diamond stress;

(5) easy to shape, and can be firmly welded with the bit steel body.

      The performance of the drill car body to adapt to the nature of the drilling layer to ensure that the diamond can be timely cutting edge, which is pregnant diamond drill bit design and selection of the basic points. According to the characteristics of deep drilling, we can use the pre-alloy powder as the carcass material, which is due to the pre-alloy powder than the mechanical mixture of powder elements evenly distributed, fundamentally avoid the segregation of components, so that the carcass tissue uniform, consistent with the performance; Powder alloying fully, so that the carcass has a high hardness and impact strength, can greatly improve the bit of the compression, bending strength, enhanced diamond inclusions, improve the life of diamond bits.

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