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Preparation method of ultrafine cemented carbide

A cemented carbide and alloy technology, which is applied in the field of ultrafine cemented carbide preparation, can solve the problem of equal adsorption of impurities on the surface of ultrafine cemented carbide, and achieve the effects of good surface finish, good alloy toughness and normal color and luster.

Active Publication Date: 2015-03-25
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ultrafine cemented carbide with excellent physical properties to solve the problem of adsorbing impurity phases on the surface of ultrafine cemented carbide

Method used

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Examples

Experimental program
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preparation example Construction

[0025] The preparation process of the ultra-fine cemented carbide of the present invention includes batching, ball milling, press molding and sintering processes; when batching, ultra-fine tungsten carbide (WC) with a Fischer particle size of 0.4-0.6 μm and a Fischer particle size of 1.0-1.5 μm are selected. Containing 6-10.5wt% cobalt (Co) powder mixed according to weight ratio; wherein WC contains 0.42-0.58wt% chromium (Cr) and 0.16-0.28wt% vanadium (V); tungsten carbide (WC) contains The ratio of chromium (Cr) to vanadium (V) is: Cr:V=2.6~2.0; the control carbon balance value is +0.06~+0.11%. Ball milling uses hexane and paraffin as grinding medium and molding agent; sintering adopts positive pressure sintering in vacuum sintering fast cooling furnace. The specific preparation method is as follows:

[0026] Step 1 Ingredients

[0027] 89.5-94 parts of ultra-fine tungsten carbide (WC) powders with a Fischer particle size of 0.4-0.6 μm, containing 0.42-0.58wt% chromium (Cr)...

example 1

[0036] Step 1 Ingredients

[0037] Mix 94 parts of superfine WC powder containing 0.42wt% Cr and 0.16wt% V with a Fischer particle size of 0.5 μm and 6 parts of Co powder with a Fischer particle size of 1.0 μm; Cr:V=2.6; the carbon balance value is +0.11%.

[0038] Step two ball milling

[0039] Add 500 mL of ball milling medium hexane, 5:1 ball-to-material ratio, 10 g of molding agent paraffin, and 1.5 g of surfactant stearic acid per Kg of the mixture in the above ingredients, and then carry out rolling ball milling together for 48 hours.

[0040] Step 3 Compression molding

[0041] The ball-milled slurry is filtered, spray-dried and granulated, and then pressed into shape by a DORST press with a pressing pressure of 200 MPa to obtain a semi-finished alloy blank.

[0042] Step 4 Sintering

[0043] The obtained semi-finished alloy blank was placed in a Shimadzu sintering furnace to remove the forming agent and sintered at a high temperature. The sintering temperature was 13...

example 2

[0046] Step 1 Ingredients

[0047] Mix 89.5 parts of superfine WC powder containing 0.58wt% Cr and 0.28wt% V with a Fischer particle size of 0.5 μm and 10.5 parts of Co powder with a Fischer particle size of 1.0 μm, Cr:V=2.0; the carbon balance value is +0.06%.

[0048] Step two ball milling

[0049] Add 500 mL of ball milling medium hexane, 5:1 ball-to-material ratio, 25 g of molding agent paraffin, and 0.5 g of surfactant stearic acid per Kg of the mixture in the above ingredients, and then carry out rolling ball milling together for 48 hours.

[0050] Step 3 Compression molding

[0051] The ball-milled slurry is filtered, spray-dried and granulated, and then pressed into shape by a DORST press with a pressing pressure of 200 MPa to obtain a semi-finished alloy blank.

[0052] Step 4 Sintering

[0053] The obtained semi-finished alloy blank was placed in a Shimadzu sintering furnace to remove the forming agent and sintered at a high temperature. The sintering temperature...

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Abstract

The invention provides a preparation method of ultrafine cemented carbide. The method comprises the steps of ingredient preparation, ball milling, compacting and moulding, and sintering. The ingredients comprise ultrafine tungsten carbide (WC) with Fisher particle size of 0.4-0.6 mum and 6-10.5 wt% of cobalt (Co) powder with Fisher particle size of 1-1.5 mum; the ultrafine tungsten carbide (WC) contains 0.16-0.28 wt% of vanadium (V) and 0.42-0.58 wt% of chromium (Cr); chromium (Cr) and vanadium (V) are in the ratio of 2.6-2.0; the controlled carbon equilibrium value is +0.06 to +0.11%; and sintering employs positive pressure sintering in a vacuum sintering quick cooling furnace. The ultrafine tungsten carbide (WC) prepared by the method of the invention has the advantages of linear intercept method average diameter of 0.42-0.49 m, flexural strength reaching 3670-4450 N / mm<2>, normal silver color of the surface, and no impurity adsorption.

Description

technical field [0001] The invention belongs to a method for preparing cemented carbide, in particular to a method for preparing ultrafine cemented carbide. Background technique [0002] Ultrafine cemented carbide has a very wide range of uses because of its high hardness, high wear resistance and high strength. Due to the high surface activity of ultrafine powder, impurity elements such as calcium (Ca) and sulfur (S) in the sintering furnace will be adsorbed on the surface of ultrafine cemented carbide to form impurity phases during the sintering process, which will affect the surface color of the alloy. , smoothness and roughness. [0003] "Surface adsorption phenomenon during the preparation process of nano WC and ultrafine cemented carbide" in the 25th issue of "INT J REFRACT MET H" (International Refractory Metals and Hard Materials) in 2007, pages 166-170 The surface adsorption phenomenon of cemented carbide during the preparation process) mentioned in the article: F...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/08
Inventor 刘小胡杨新宇
Owner ZIGONG CEMENTED CARBIDE CORP
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