Process for preparing grapheme modified hard alloy

A technology of graphene modification and cemented carbide, which is applied in the field of cemented carbide preparation, can solve the problems such as carbon content distribution needs to be improved, and achieve the effects of overcoming poor uniformity of addition, reducing sintering defects, and uniform carbon content

Active Publication Date: 2014-06-04
滁州用朴合金工具有限公司
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Problems solved by technology

However, in this method, the carbon content distribution still needs to be improved

Method used

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  • Process for preparing grapheme modified hard alloy
  • Process for preparing grapheme modified hard alloy
  • Process for preparing grapheme modified hard alloy

Examples

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preparation example Construction

[0027] Further, the efficient preparation method of the graphene-modified cemented carbide may comprise the following steps:

[0028] Step 1, adding the calculated graphene oxide into the ethanol solution to disperse into a uniform suspension;

[0029] Step 2. Mix the calculated ratio of nano-W powder, nano-Co powder or Ni powder with the graphene oxide ethanol dispersion, and add pre-milled Cr 2 o 3 Powder slurry, followed by ball milling to achieve good mixing of graphene with nano metal powder and oxide powder;

[0030] Step 3, powder drying;

[0031] Step 4, granulation;

[0032] Step 5, molding and pressing;

[0033] Step 6. Vacuum degreasing to remove the molding agent;

[0034] Step seven, sintering and forming.

[0035] The graphene oxide added in step 1 can be single-layer, few-layer and multi-layer graphene oxide, and its metering ratio is calculated according to the carbon content required by the W powder carbonization process and sintering process conditions;...

Embodiment 1

[0041] Example 1 The efficient preparation method of the graphene modified cemented carbide is:

[0042] Graphene oxide with a weight percentage of 5% relative to the cemented carbide raw material is ultrasonically dispersed in ethanol, and then nano-W powder, nano-Co powder, Cr 2 o 3 The powder is added and mixed, ball milled in a planetary ball mill at 200 rpm for 24 hours, then vacuum-dried, mixed with 3wt% polyvinyl alcohol binder relative to the cemented carbide raw material weight percentage, granulated, 350 MPa compression molding, 0.5 degree Raise the temperature to 350 degrees per minute to degrease for 3 hours, and vacuum sinter and densify at 1350 degrees to obtain graphene-modified cemented carbide.

Embodiment 2

[0043] Example 2: The difference between this example and Example 1 is that the amount of graphene added is 1wt%, and its mechanical properties are shown in Table 1.

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Abstract

The invention discloses a process for preparing a grapheme modified hard alloy. Preferably, the process comprises the steps of dispersing graphene oxide uniformly to form a suspension dispersion liquid, then mixing the liquid with nano W powder, nano Co and / or nano Ni powder and Cr2O3 powder, subjecting to process steps such as ball milling, drying, pelleting, press forming and sintering, and obtaining a target product. According to the process, a traditional powder metallurgy technology is used, the carbonization and sintering densification process is finished once by addition of nano high-activity constituents, rapid preparation of hard alloy products is achieved, the production efficiency and the overall performance of the hard alloy are greatly improved, and the process is applicable to large-scale industrial production and compatible and integrated with existing hard alloy industry preparation processes.

Description

technical field [0001] The invention relates to a preparation method of hard alloy, in particular to a preparation method of graphene-modified hard alloy. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has a high hardness at 1000°C, and is widely used as industrial cutting tools, mining drills, wear-resistant parts, precision parts, etc. The traditional industrial preparation method of cemented carbide is mainly based on powder metallurgy method, which mixes carbide and metal binder, presses and molds, and forms a dense alloy after sintering. Therefore, a large number of carbides...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 王永富陈名海
Owner 滁州用朴合金工具有限公司
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