Polycrystalline diamond and its preparation method and use
A technology of polycrystalline diamond and diamond, which is applied in the field of polycrystalline diamond and its preparation, can solve the problem of few polycrystalline diamond grinding edges, and achieve the effect of low pollution and suitable for large-scale large-scale production
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[0076] Specifically, the above preparation method includes the following steps:
[0077] 1) Mix catalyst, graphite, hydroxycopper powder, silicon powder and hexagonal boron carbide evenly and press them into columns, and assemble them with pyrophyllite blocks to form composite blocks;
[0078] 2) Put the synthetic block into the high-pressure chamber of the six-sided top press, pressurize quickly to 10-10.5MPa in 3-30 seconds, then slowly increase the pressure to 55-65MPa, and keep the pressure; when the pressure increases to 35- At 40MPa, start heating, and the temperature rises from room temperature to 1600-1800°C for heat preservation;
[0079] 3) In step 2), after the end of the pressure holding at 55-65MPa, the pressure is quickly increased to 70-80MPa for pressure holding;
[0080] 4) After the pressure holding at 70-80MPa in step 3), the temperature drops from 1600-1800°C to 1400-1500°C and remains unchanged;
[0081] 5) After the temperature drops to 1400-1500°C, the...
Embodiment 1
[0102] A polycrystalline diamond, mainly prepared from the following raw materials in weight percentage: catalyst and graphite 99.97%, hydroxy copper powder 0.01%, silicon powder 0.01% and hexagonal boron carbide 0.01%; wherein, the weight ratio of catalyst and graphite is 1 :20.
Embodiment 2
[0104] The polycrystalline diamond in the present embodiment is prepared by the following method, and the specific steps are as follows:
[0105] 1) The catalyst, graphite, hydroxyl copper powder, silicon powder and hexagonal boron carbide in Example 1 are mixed and pressed evenly into a column, and assembled into a synthetic block with pyrophyllite block;
[0106] 2) Put the synthetic block into the high-pressure chamber of the six-sided top press, pressurize, first pressurize to 10.5MPa after 5 seconds, then pressurize to 65MPa at a pressurization rate of 1MPa / s, and keep the pressure for 1min; when the pressure increases When the pressure reaches 35MPa, start heating, and the temperature is raised from room temperature to 1800°C for 15 seconds to keep warm;
[0107] 3) Pressurize at 65MPa for 1min, pressurize to 80MPa after 15 seconds, and keep the pressure for 1min;
[0108] 4) After the end of pressure holding, the temperature drops from 1800°C to 1400°C after 5 seconds ...
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