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Preparation method of polycrystalline diamond compact SEM sample

A polycrystalline diamond and composite sheet technology, applied in the preparation of test samples, metal processing equipment, sampling, etc., can solve the problems of low yield and long sample preparation time, and achieve the goal of ensuring parallelism and improving sample preparation quality. Effect

Active Publication Date: 2022-04-19
SF DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing polycrystalline diamond compact SEM samples, which solves the problems of long sample preparation time and low yield in existing methods

Method used

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  • Preparation method of polycrystalline diamond compact SEM sample
  • Preparation method of polycrystalline diamond compact SEM sample
  • Preparation method of polycrystalline diamond compact SEM sample

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Effect test

preparation example Construction

[0027] Specifically, the preparation method of the above-mentioned polycrystalline diamond compact SEM sample includes the following steps in turn:

[0028] Step 1: Cut in half along the radial direction of the sample by using medium-feeding WEDM equipment, cutting parameters: pulse width 0.8-1.0ms, pulse interval 48-52ms;

[0029] Step 2, clamp the prefabricated sample obtained in step 1 on the grinding and polishing fixture of the corresponding specification, assemble the fixture on the tool grinder and fasten it;

[0030] Step 3, assemble the grinding wheel with a grain size of W40-W80 on the tool grinder, and roughly grind the sample in step 2. Grinding parameters: the speed of the grinding wheel ≥ 2200r / min, the lateral oscillation frequency of the grinding wheel 2-4 times / s (horizontal Refers to the plane where the working surface of the grinding wheel is located or parallel to the radial direction of the composite sheet), the single feed amount is 0.01-0.03mm, the feed ...

Embodiment 1

[0043] The preparation method of the polycrystalline diamond compact SEM sample of the present embodiment comprises the following steps:

[0044] (1) Cutting in half along the radial direction of the sample by medium-feeding wire electric discharge cutting equipment, cutting parameters: pulse width 0.9ms, pulse interval 50ms, sample diameter 15.9mm, cutting completed in 1 hour, the sample after cutting The groove depth at the joint between the alloy and PCD is 0.02mm.

[0045] (2) Clamp the prefabricated sample to the grinding and polishing fixture of the corresponding specification (diameter 16mm). The subsequent grinding and polishing operations are all carried out on the tool grinder and the cooling water is turned on. The ceramic grinding wheel with a particle size of W40 is used for rough grinding. The grinding wheel The rotation speed is 2800r / min, the single feeding amount is 0.02mm, the feeding interval is 30s, and the rough grinding of the entire cutting surface of th...

Embodiment 2

[0049] The preparation method of the polycrystalline diamond compact SEM sample of the present embodiment comprises the following steps:

[0050] (1) Use medium-feeding wire electric discharge cutting equipment to cut in half along the radial direction of the sample, cutting parameters: pulse width 1.0ms, pulse interval 50ms, sample diameter 15.9mm, complete cutting in 1 hour, and the sample after cutting The groove depth at the joint between the alloy and PCD is 0.03mm.

[0051] (2) Clamp the prefabricated sample to the fixture of the corresponding specification (diameter 16mm). The subsequent grinding and polishing operations are carried out on the tool grinder and the cooling water is turned on. The ceramic grinding wheel with a particle size of W50 is used for rough grinding, and the grinding wheel speed is 2800r / min, the single feed amount is 0.02mm, the feed interval is 30s, the rough grinding of the entire cutting surface of the sample is completed in 10 minutes, the l...

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Abstract

The invention belongs to the field of preparation of samples for testing, and particularly relates to a preparation method of a polycrystalline diamond compact SEM sample. The method comprises the following steps: (1) cutting a to-be-tested polycrystalline diamond compact sample, fixing the cut sample on a grinding and polishing clamp, exposing a cutting surface, and enabling the cutting surface to extend along the vertical direction; (2) a grinding wheel is used for conducting vertical opposite grinding on the cutting face under the water cooling condition, and a groove in the combination position of the polycrystalline diamond layer and the alloy matrix on the cutting face is ground to be flat; and (3) under the water cooling condition, a grinding wheel is used for conducting vertical opposite grinding and grinding and polishing machining on the cutting face till the requirement is met. The grinding and polishing clamp is combined with vertical opposite grinding, the parallelism during grinding and polishing machining is guaranteed, oxidation and graphitization of the polycrystalline diamond are avoided by adopting a wet grinding mode during vertical opposite grinding, grinding wheel machining is adopted for grinding and subsequent grinding and polishing machining, damage to crystal grains or crystal boundaries of the polycrystalline diamond with the hard and brittle characteristics can be avoided, and the service life of the polycrystalline diamond is prolonged. And the sample preparation quality can be improved.

Description

technical field [0001] The invention belongs to the field of preparation of test samples, and in particular relates to a preparation method of a polycrystalline diamond composite sheet SEM sample. Background technique [0002] Polycrystalline diamond compact (PDC) is a composite material made of pre-synthesized diamond powder as raw material, WC alloy as substrate, and sintered at high temperature and high pressure. It has both the high hardness of diamond and the excellent toughness of cemented carbide. Synthetic hard materials are difficult to compete with. From the research and theory of sintered materials, it is shown that the grain growth, binder diffusion, bond bonding, phase transition and impact resistance, wear resistance, thermal stability and other service properties of polycrystalline diamond composite sheets are related to the microstructure of the material ( D-D bonds, sintered density, defects, second phase) and element distribution are closely related. In or...

Claims

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Application Information

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IPC IPC(8): B24B7/22B24B55/02B24B29/02B23H7/02G01N1/28G01N1/32
CPCB24B7/22B24B55/02B24B29/02B23H7/02G01N1/32G01N1/286G01N2001/2873
Inventor 郭昂杜卫锋张生志方海江
Owner SF DIAMOND CO LTD