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Nanometer binder and polycrystalline diamond clad sheet used for cutter, prepared by utilizing same

A diamond polycrystal and bonding agent technology, applied in the application of ultra-high pressure process, etc., to achieve the effect of eliminating adverse effects, breaking through technical bottlenecks, breaking through high wear resistance and high impact toughness

Active Publication Date: 2015-02-25
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the limitations of formula and process, the domestic PCD products have the following problems: 1) The wear ratio of the composite sheet is 280,000-320,000 (foreign is about 380,000)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A diamond polycrystalline composite sheet for cutting tools, including a diamond polycrystalline layer and a cemented carbide substrate. The diamond polycrystalline layer is composed of the following raw materials in weight percentages: 94% diamond powder (particle size 4 μm) and 6% nano-bonding agent, The cemented carbide substrate is composed of the following raw materials by weight percentage: 89.5% of tungsten carbide powder (particle size 1.8 μm) and 10.5% of analytically pure cobalt powder (1.0 μm); the nano-bonding agent is composed of the following raw materials by weight percentage: analysis Pure Co powder (particle size 20nm) 97.5%, analytical pure NbC powder (particle size 20nm) 1.5%, analytical pure B powder (particle size 30nm) 1%.

[0024] The preparation method of the above-mentioned polycrystalline diamond composite sheet comprises the following steps:

[0025] (1) Purification and reduction treatment: Boil the diamond powder with 35% sodium hydroxide aq...

Embodiment 2

[0031] A diamond polycrystalline composite sheet for cutting tools, including a diamond polycrystalline layer and a cemented carbide substrate. The diamond polycrystalline layer is composed of the following raw materials in weight percentages: 97% of diamond powder (particle size 6 μm) and 3% of nano-bonding agent, The cemented carbide substrate is composed of the following raw materials in weight percentage: 90.5% of tungsten carbide powder (particle size 2.2 μm) and 9.5% of analytically pure cobalt powder (1.2 μm); the nano-bonding agent is composed of the following raw materials in weight percentage: analysis Pure Co powder (particle size 25nm) 99.5%, analytical pure NbC powder (particle size 25nm) 0.45%, analytical pure B powder (particle size 35nm) 0.05%.

[0032] The preparation method of the above-mentioned polycrystalline diamond composite sheet comprises the following steps:

[0033] (1) Purification and reduction treatment: Boil the diamond powder with 40% sodium hyd...

Embodiment 3

[0039] A diamond polycrystalline composite sheet for cutting tools, including a diamond polycrystalline layer and a cemented carbide substrate, the diamond polycrystalline layer is composed of the following raw materials in weight percentage: 95% diamond powder (particle size 5 μm) and 5% nano-bonding agent, The cemented carbide substrate is composed of the following raw materials in weight percentage: 90% of tungsten carbide powder (particle size 2.0 μm) and 10% of analytically pure cobalt powder (1.0 μm); the nano-bonding agent is composed of the following raw materials in weight percentage: analysis Pure Co powder (particle size 23nm) 99%, analytical pure NbC powder (particle size 22nm) 0.8%, analytical pure B powder (particle size 33nm) 0.2%.

[0040] The preparation method of the above-mentioned polycrystalline diamond composite sheet comprises the following steps:

[0041] (1) Purification and reduction treatment: Boil the diamond powder with 37% sodium hydroxide aqueous...

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PUM

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Abstract

The invention relates a nanometer binder which comprises the following raw materials according to the weight percent: 97.5-99.5% of Co powder, 0.45-1.5% of Nb C powder and 0.05-1% of B powder. The invention further discloses a polycrystalline diamond clad sheet used for a cutter, which is prepared by utilizing the nanometer binder. The polycrystalline diamond clad sheet includes a polycrystalline diamond layer and a cemented carbide substrate and comprises the following raw materials according to weight part: 94-97% of diamond powder and 3-6% of nano-metal binder. The polycrystalline diamond clad sheet used for the cutter adopts the nanometer binder in a glomerocryst layer recipe, breaks through the technological difficulties of high wear resistance and high flexure strength, increases the wear-resisting and heat-resistant quality of the cutter, and prolongs the service life of the cutter.

Description

technical field [0001] The invention belongs to the technical field of bonding agent and composite cutting tool material, and in particular relates to a nano bonding agent and a diamond polycrystalline composite sheet for cutting tools made of the bonding agent. Background technique [0002] Diamond polycrystalline compact (PCD) for cutting tools is a superhard composite material that is sintered under high temperature and high pressure conditions through a specific synthesis process using diamond micropowder as the raw material and cemented carbide as the matrix. The composite sheet has the advantages of high diamond hardness, good wear resistance and strong impact resistance of cemented carbide, and is widely used in the field of cutting non-ferrous metals and difficult-to-machine non-metallic materials. [0003] Foreign developed countries have successfully developed diamond polycrystalline composite sheets for cutting tools since the early 1980s. After more than 30 years...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C26/00C22C1/04B01J3/06
Inventor 卢灿华张涛刘俊涛窦明
Owner ZHONGNAN DIAMOND CO LTD
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