Preparation method of diamond enhanced tungsten carbide composite spherical crown button with gradient structure

A cemented carbide, gradient structure technology, applied in the field of cemented carbide to achieve the effect of increasing strength and wear resistance, improving strength and toughness, and saving time

Active Publication Date: 2015-03-25
江西耀升钨业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In deep well construction, about 70% of the time is spent on drilling and tripping. It can be seen that the lack of wear resistance is the main reason for the short life and low efficiency of the current drill bit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a diamond cemented carbide composite button with a gradient structure, the specific steps are:

[0030] Preparation of ultra-coarse tungsten carbide:

[0031] Reduce tungsten oxide under hydrogen at 800-850°C to obtain tungsten powder, and then carry out ball milling to prepare carbon, control the content of combined carbon in tungsten carbide to be greater than >6.1wt%, and the content of free carbon to be ≤0.03wt%, and finally mix The material is carbonized at high temperature in a fully automatic high-temperature four-tube reduction furnace to obtain tungsten carbide, wherein the carbonization temperature is 1250-1300 ° C, and the carbonization atmosphere is vacuum.

[0032] 1) By weight, add 96 parts of tungsten carbide and 4 parts of cobalt powder into the ball mill, use alcohol as the medium, and cemented carbide balls as the grinding body to grind for 18 hours, then dry the material, and then add rubber solution with a total weight of 0.3% ...

Embodiment 2

[0036] A method for preparing a diamond cemented carbide composite button with a gradient structure, the specific steps are:

[0037] 1) By weight, add 97 parts of tungsten carbide and 3 parts of cobalt powder into the ball mill, use alcohol as the medium and cemented carbide balls as the grinding body to grind for 22 hours, then dry the material, and then add rubber solution with 0.3% of the total weight of the material Mix evenly and dry, then fill the material into a button mold and press to form, sinter at 1320-1350°C for 70min under the protection of nitrogen or argon, and finally lower the temperature to 225-280°C for 2 hours, and cool to room temperature A cemented carbide substrate with a gradient distribution of cobalt content is obtained;

[0038]2) Mix the diamond powder and cubic boron nitride evenly at a weight ratio of 1:1, then pre-press into a transition layer in a shape that matches the upper end of the cemented carbide substrate, place it on the top of the ce...

Embodiment 3

[0041] A method for preparing a diamond cemented carbide composite button with a gradient structure, the specific steps are:

[0042] 1) By weight, add 96.5 parts of tungsten carbide and 3.5 parts of cobalt powder into the ball mill, use alcohol as the medium, and cemented carbide balls as the grinding body to grind the material for 20 hours, then dry the material, and then add rubber solution with a total weight of 0.3% of the material Mix evenly and dry, then fill the material into a button mold and press to form, sinter at 1320-1350°C for 60min under the protection of nitrogen or argon, and finally lower the temperature to 225-280°C for 1.5h, and cool to A cemented carbide substrate with a gradient distribution of cobalt content is obtained at room temperature;

[0043] 2) Mix the diamond powder and cubic boron nitride evenly at a weight ratio of 1:1, then pre-press into a transition layer in a shape that matches the upper end of the cemented carbide substrate, place it on ...

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Abstract

The invention provides a preparation method of a diamond enhanced tungsten carbide composite spherical crown button with a gradient structure. The preparation method comprises the following steps: at first, preparing a cemented carbide substrate with cobalt content gradient distribution, and then compounding a transition layer made of diamond and cubic boron nitride, and a polycrystalline diamond layer on the cemented carbide substrate to obtain the enhanced tungsten carbide composite spherical crown button. The cobalt contents in the spherical crown button is high, so that the spherical crown button has relatively high toughness; the outermost layer is the polycrystalline diamond layer, so that the spherical crown button has relatively high abrasive resistance; meanwhile, the transition layer is formed by mixing cubic boron nitride and diamond, so that the bonding quality is ensured. The diamond enhanced tungsten carbide composite spherical crown button has high abrasive resistance and toughness at the same time, can greatly prolong the service life, improves the working efficiency, and reduces the operation cost.

Description

technical field [0001] The invention relates to the technical field of cemented carbide, in particular to a method for preparing a diamond cemented carbide composite button with a gradient structure. Background technique [0002] Cemented carbide has high hardness, strength, wear resistance and corrosion resistance. It is used in the manufacture of cutting tools, knives, drilling tools and wear-resistant parts. It is widely used in military industry, aerospace, machining, metallurgy, oil drilling , mining tools, electronic communications, construction and other fields. [0003] When the cemented carbide button is used, it is not only affected by impact load and torsional load, but also needs to withstand severe wear from rocks, which requires that the cutting teeth not only need sufficient impact toughness, but also need high wear resistance. However, common cemented carbide buttons are mostly made of WC-Co cemented carbide, and its performance depends on the content and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F7/06
Inventor 郭建锋郭华彬刘小平赵迎九邓传林王贤标黄腾崔宇明谢远海
Owner 江西耀升钨业股份有限公司
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