Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof

A technology of composite powder and cemented carbide, which is applied in the field of preparation of tungsten carbide-based ultrafine cemented carbide, can solve problems such as limiting carbonization temperature, and achieve the effects of low production cost, simple and safe process, and low preparation temperature

Inactive Publication Date: 2006-07-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advancement of this method lies in the introduction of soluble salts of inhibitors in the early stage, but because the presence of cobalt limits the subsequent carbonization temperature, it is more suitable for the introduction of inhibitors with low carbonization temperatures (such as vanadium carbide, etc.), while for chromium, tantalum etc., it is difficult to completely carbonize, and there will still be a small amount of oxide or carbon-deficient phase in the WC matrix, so other methods must be used

Method used

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  • Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof
  • Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof
  • Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: ammonium metatungstate AMT ((NH 4 ) 6 (H 2 W 12 o 40 )·4H 2 O), ammonium metavanadate (NH 4 VO 3 ), ammonium dichromate ((NH 4 ) 2 Cr 2 o 7 ) is miscible in distilled water at a mass ratio of 100:0.66:0.74, and is made into oxide powder by spray pyrolysis. The oxide powder and carbon powder were weighed according to the mass ratio W: C=3.83:1, V: C=1.21:1, Cr: C=2.00:1, and put into a roller mill for dry grinding for 72 hours (material: ball =1:2), the resulting mixed powder was carbonized in a tube furnace in an argon atmosphere at 1350°C for 0.5 hours, and then cooled to room temperature in argon. At the same time a comparative experiment was carried out in this furnace: using WO 3 +C, V 2 o 5 +C, Cr 2 o 3 +C are three additionally prepared raw materials, wherein the ratio of tungsten, vanadium, chromium and carbon all follows the ratio of this embodiment. The XRD pattern of the carbonized powder is shown in the appendix of the instructi...

Embodiment 2

[0052] Embodiment 2: ammonium paratungstate APT ((NH 4 ) 10 (H 2 W 12 o 42 )·4H 2 O), ammonium metavanadate (NH 4 VO 3 ), ammonium dichromate ((NH 4 ) 2 Cr 2 o 7 ) is miscible in distilled water according to the mass ratio of 100:0.44:0.50, and is made into oxide powder by centrifugal pressure spray drying. W: C = 3.83: 1, V: C = 1.21: 1, Cr: C = 2.00: 1 Weigh it, put it into a roller ball mill, and use absolute alcohol as the medium for wet grinding for 48 hours (material: ball: liquid = 1 : 3: 0.8), the mixed powder obtained after drying was carbonized at 1000° C. for 12 hours in a rotary furnace in a nitrogen atmosphere, and then cooled to room temperature in a nitrogen atmosphere. The characteristic parameters of the WC-inhibitor composite powder made by testing are: tungsten content W=93.27wt%, C t = 6.15wt%, C f =0.05wt%, O=0.10wt%, other metal element content=0.43wt%, BET=2.62m 2 / g. Add cobalt powder (Fess=0.6 μm, 10wt%) and appropriate amount of carbon ...

Embodiment 3

[0053] Embodiment 3: ammonium metatungstate AMT ((NH 4 ) 6 (H 2 W 12 o 40 )·4H 2 O), ammonium metavanadate (NH 4 VO 3 ) is miscible in distilled water according to the mass ratio of 100:1.03, and is spray-dried by centrifugal pressure to make oxide powder. =3.83:1, V:C=1.21:1 weighed, put into a ball mill, wet milled with acetone as a medium for 48 hours (material: ball: liquid=1:4:0.8), the mixed powder obtained after drying Carburize in the furnace at 1300°C for 2 hours, then cool to room temperature with the furnace. The characteristic parameters of the WC-inhibitor composite powder made by testing are: tungsten content W=91.23wt%, C t = 6.45wt%, C f =0.04wt%, O=0.13wt%, other metal element content=2.15wt%, BET=2.66m 2 / g. Add diamond powder (Fess=1.0μm, 30wt%) and appropriate amount of carbon powder and molding agent to WC-inhibitor composite powder for ball milling, drying, molding, vacuum sintering (1250°C, 3h), hot isostatic pressing ( 1200°C, 1h, 200MPa), t...

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Abstract

The preparation method for WC-inhibitor composite powder and its ultrafine hard alloy comprises: first, preparing oxide powder with carbon and inhibitor; composing the composite powder with direct reducing carbon method; adding metal powder to grind, dry, form, and vacuum sinter or thermal treat after H2 sintering, or low-pressure sintering directly, and obtaining the ultrafine or nano WC-base hard alloy. This invention introduces multiple inhibitors in early stage to overcome the defect in prior art, selects environment-friendly materials and temperature lower than traditional method, and needs low cost fit to industrialization.

Description

technical field [0001] The invention belongs to a preparation method of tungsten carbide-based ultrafine hard alloy. Background technique [0002] Ultra-fine-grained tungsten carbide (hereinafter referred to as "WC")-based cemented carbide has the "double high" performance of high strength and high hardness, and can be applied to the production of micro-drills for printed circuit boards, printing needles for dot-matrix printers, precision molds, difficult Processing materials, knives, etc. When the grain size of WC is reduced and the distribution of cobalt in the binder phase is highly uniform, the number and size of defects will be reduced or even zero, and the mechanical properties of the alloy can be much higher than that of ordinary cemented carbide. There are two key processes in the preparation of ultrafine-grained WC-based cemented carbide: one is the preparation of WC or WC-Co raw material powder with fine grains and uniform particle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F9/00
Inventor 邵刚勤熊震史晓亮段兴龙李勇孙鹏王天国
Owner WUHAN UNIV OF TECH
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