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Sintering technology for high-specific gravity tungsten alloy

A tungsten alloy, high specific gravity technology, applied in the field of powder metallurgy, can solve the problems of high production cost of high specific gravity tungsten alloy, low raw material utilization rate, high product rejection rate, low rejection rate, improved raw material utilization rate, and reduced production. cost effect

Inactive Publication Date: 2012-08-15
XIAN HUASHAN TUNGSTEN PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 90WNiFe alloy and 93WNiFe alloy belong to tungsten alloys with low tungsten content and high specific gravity. The sintering process of existing high specific gravity tungsten alloys generally adopts one-time sintering. stay high
Taking the 90WNiFe alloy containing 90wt% tungsten and the 93WNiFe alloy containing 93% tungsten as examples, the raw material utilization rate of the 90WNiFe alloy sintered by the existing process is only 60%, and the raw material utilization rate of the 93WNiFe alloy sintered by the existing process Only 63%, serious waste of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1. According to the nominal (90W-7Ni-3Fe) composition of the high-density tungsten alloy 90WNiFe alloy, the ingredients are mixed by conventional methods and then pressed to obtain a 90WNiFe alloy compact;

[0025] Step 2. Put the 90WNiFe alloy compact described in step 1 into the muffle furnace, and under the protection of ammonia decomposition gas, sinter the sintering temperature once at 1400°C and push the boat at a speed of 7mm / s. Cool with the furnace under the protection of decomposition gas to obtain pre-sintered compact;

[0026] Step 3. Put the pre-sintered billet described in step 2 into a muffle furnace. Under the protection of ammonia decomposition gas, the sintering temperature is 1410°C, and the speed of pushing the boat is 7mm / s. Cool with the furnace under the protection of decomposition gas to obtain 90WNiFe alloy.

[0027] Using the sintering process of this example to produce 2 tons of 90WNiFe alloy products, the amount of sintering deformation...

Embodiment 2

[0029] This embodiment is the same as Embodiment 1, except that the sintering temperature of the primary sintering is 1420° C., and the speed of pushing the boat is 10 mm / s; the sintering temperature of the secondary sintering is 1430° C. The boat pushing speed for secondary sintering is 10mm / s.

[0030] Using the sintering process of this example to produce 2 tons of 90WNiFe alloy products, the amount of sintering deformation is reduced from 23% of the existing conventional process to 14%, and the material utilization rate is increased from 60% of the existing conventional process to 75%. Compared with the existing conventional sintering process, it saves 500kg of raw materials and more than 60,000 yuan in cost.

Embodiment 3

[0032] This embodiment is the same as Embodiment 1, except that the sintering temperature of the primary sintering is 1410° C., and the boat pushing speed of the primary sintering is 8 mm / s; the sintering temperature of the secondary sintering is 1420° C. The boat pushing speed for the secondary sintering is 8mm / s.

[0033] Using the sintering process of this example to produce 2 tons of 90WNiFe alloy products, the amount of sintering deformation is reduced from 23% of the existing conventional process to 14%, and the material utilization rate is increased from 60% of the existing conventional process to 75%. Compared with the existing conventional sintering process, it saves 500kg of raw materials and more than 60,000 yuan in cost.

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Abstract

The invention discloses a sintering technology for a high-specific gravity tungsten alloy, which comprises the following steps of: 1) preparing materials according to a nominal composition of the high-specific gravity tungsten alloy, mixing materials according to a conventional method, and then pressing, thereby obtaining an alloy pressed blank; 2) primarily sintering the alloy pressed blank and cooling in furnace, thereby obtaining a pre-sintered blank; and 3) secondarily sintering the pre-sintered blank and cooling in furnace, thereby obtaining an alloy. According to the sintering technology for the high-specific gravity tungsten alloy, twice sintering is adopted, deformation of materials in the sintering process is reduced and the use ratio of raw materials is increased, so that the production cost of the products is lowered. By adopting the temperature of the twice sintering according to the sintering technology provided by the invention, the volume of sintering liquid phase in the tungsten alloy material is effectively controlled, the viscosity of a sintered body is increased, the mobility of the sintered body is reduced, and the sintering blank at high temperature has the capability of maintaining the shape of the original pressed blank and avoiding serious deformation.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a sintering process of a high specific gravity tungsten alloy. Background technique [0002] 90WNiFe alloy and 93WNiFe alloy belong to tungsten alloys with low tungsten content and high specific gravity. The sintering process of existing high specific gravity tungsten alloys generally adopts one-time sintering. Stay high. Taking the 90WNiFe alloy containing 90wt% tungsten and the 93WNiFe alloy containing 93% tungsten as examples, the raw material utilization rate of the 90WNiFe alloy sintered by the existing process is only 60%, and the raw material utilization rate of the 93WNiFe alloy sintered by the existing process Only 63%, the waste of raw materials is serious. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a sintering process of high specific gravity tungsten alloy in view of the above-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04
Inventor 张广卫郑军刘晓丹罗崇玲王义民翁红卫
Owner XIAN HUASHAN TUNGSTEN PROD CO LTD
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