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polycrystalline diamond

A technology of polycrystalline diamond and crystal form, applied in the field of polycrystalline diamond, can solve the problems of sharpness and wear resistance of diamond grinding wheels, low impact toughness and strength, and poor wear resistance of tools, so as to achieve good self-sharpening performance, improve strength, High grinding efficiency

Active Publication Date: 2020-12-29
HENAN FAMOUS DIAMOND IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the restriction of the surface roughness and sharpness requirements of the manufactured polycrystalline diamond, its impact toughness and strength are at a low level, which will cause the manufactured diamond grinding wheel to be sharp and not wear-resistant; and after the strength is increased, its sharpness will be affected. Influence, causing the wear resistance of the tool is not sharp

Method used

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Embodiment 1

[0024] Such as figure 2 image 3 As shown, a polycrystalline diamond, the polycrystalline diamond crystal form is an irregular sheet structure, and its microstructure has a large number of pores and polygonal particles of 50-100nm.

Embodiment 2

[0026] A tool using polycrystalline diamond with an irregular flaky crystal structure. The tool has high sharpness and high processing efficiency.

Embodiment 3

[0028] Such as figure 1 As shown, a polycrystalline diamond synthesis process, the steps are as follows: 1) Slowly heat the NiMn alloy to 400°C in a muffle furnace, keep it warm for 1 hour, and then cool it to room temperature;

[0029] 2) Mix NiMn alloy and graphite carbon powder evenly to make a synthetic rod;

[0030] 3) High temperature and high pressure synthesis of synthetic rods by static pressure catalyst method; figure 1 Shown, the synthesis pressure of hydrostatic catalyst method is controlled by pressure-time curve, and heating power is controlled by power-time curve, and the diamond micropowder crystal seed crystal that contains catalyzer weight ratio 20%-25% in described synthetic rod; In described power-time curve The total heating time is 220s, in which the heating power is kept constant for the first 120s, and the heating power is gradually increased by 10-15% in the last 100s. This heating method is conducive to improving the strength of the generated polycry...

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Abstract

The invention discloses polycrystalline diamond, a tool and a polycrystalline diamond synthetic process. The polycrystalline diamond crystal form is macroscopically of an irregular flaky structure andis microcosmically and densely covered with pores and polygonal particles. The tool comprises the polycrystalline diamond. The polycrystalline diamond synthetic process uses a seeding method and a static catalyst method. The polycrystalline diamond, the tool and the polycrystalline diamond synthetic process have the beneficial effects that graphite is carbonized into the polycrystalline diamond through short-time high temperature and high pressure by the seeding method; the power is slowly raised in the heating process, so that the product intensity is favorably improved; the impact toughness(TI) and the thermal impact toughness (TTI) of the synthetized polycrystalline diamond reach 80 percent or higher of that of monocrystal saw blade grade diamond. The polycrystalline diamond providedby the invention has the characteristics of high intensity, high grinding efficiency and good self-sharpening performance. The manufactured tool has high sharpness and high processing efficiency.

Description

technical field [0001] The invention relates to superhard materials, synthesis technology and application fields, in particular to a polycrystalline diamond. Background technique [0002] Diamond is a superhard material with high hardness. It is mainly used to make various diamond tools, such as grinding tools, wire drawing dies, cutting tools and drilling tools. The diamonds produced in the world are mainly single crystals, which have been widely used. Man-made and natural diamonds are mostly single crystals, and the crystal itself is a complete large grain. Single crystal is a single particle with a complete crystal shape, and the lattice inside the particle is arranged periodically and has anisotropy; polycrystal is a particle with multiple crystal grains, and the lattice of each crystal grain is arranged periodically , is isotropic. Polycrystalline is a collection of single crystals with many oriented grains, and crystals are composed of many small grains. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
CPCB01J3/06
Inventor 李建林陈铮牛富宏李淑云李立李花蕾赵春红司蕊蕊
Owner HENAN FAMOUS DIAMOND IND CO LTD
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