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Method for eliminating internal quality defects of tungsten alloy

A technology of internal quality and tungsten alloy, which is applied in the field of eliminating internal quality defects of tungsten alloy, can solve problems such as looseness and cracks in the core, and achieve the effect of improving internal quality, wide application range and simple method

Active Publication Date: 2020-10-27
XIAN HUASHAN TUNGSTEN PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the low-melting-point alloy, that is, the cohesive block, is melted and flowed to the defects such as looseness and cracks inside the tungsten alloy matrix material through solid phase diffusion and liquid phase diffusion, and the liquid phase formation, particle rearrangement, dissolution and precipitation of the tungsten alloy are carried out. Sintering process, so as to eliminate quality defects such as porosity and cracks inside the tungsten alloy, and solve core quality problems such as porosity and cracks in the core of tungsten alloy products, especially large tungsten alloy products, during the liquid phase sintering process

Method used

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  • Method for eliminating internal quality defects of tungsten alloy
  • Method for eliminating internal quality defects of tungsten alloy
  • Method for eliminating internal quality defects of tungsten alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment includes the following steps:

[0039] Step 1. Pour iron powder and nickel powder into a mixer and mix for 6 hours to obtain mixed powder; the mass content of nickel powder in the mixed powder is 70%, the mass content of iron powder is 30%, and the mixed powder is added with Manganese powder, the amount of manganese powder added is 0.05% of the mass of the mixed powder; the ball-to-material ratio used for mixing is 0.225:1, and the grinding ball used is a steel ball with a diameter of 12mm;

[0040] Step 2, put the mixed powder obtained in step 1 through a 140 mesh sieve and put it into a latex sleeve, press it into a compact by cold isostatic pressing, and then trim it with a wire saw; the pressure of the cold isostatic pressing is 120MPa, The holding time is 2min;

[0041] Step 3, placing the trimmed compact in step 2 in a muffle furnace for sintering for pre-alloying treatment to prepare a cohesive block; the temperature for sintering for pre-alloyin...

Embodiment 2

[0047] This embodiment includes the following steps:

[0048] Step 1. Pour tungsten powder, iron powder, nickel powder and cobalt powder into a mixer and mix for 8 hours to obtain a mixed powder; the mass content of the tungsten powder in the mixed powder is 30%, and the mass content of the nickel powder is 44%. The mass content of iron powder is 25.7%, the mass content of cobalt powder is 0.3%, and manganese powder is added to the mixed powder, and the amount of manganese powder added is 0.5% of the mass of the mixed powder; the ball-to-material ratio used for mixing is 0.225:1 , the grinding ball used is a steel ball with a diameter of 14mm;

[0049] Step 2, pass the mixed powder obtained in step 1 through a 140 mesh sieve and put it into a latex sleeve, press it into a compact by cold isostatic pressing, and then trim it with a wire saw; the pressure of the cold isostatic pressing is 150MPa, The holding time is 8 minutes;

[0050] Step 3, placing the trimmed compact in st...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] Step 1. Pour iron powder, tungsten powder, nickel powder and cobalt powder into a mixer and mix for 10 hours to obtain a mixed powder; the mass content of the tungsten powder in the mixed powder is 40%, and the mass content of the nickel powder is 35.7%. The mass content of iron powder is 23.8%, the mass content of cobalt powder is 0.5%, and manganese powder is added to the mixed powder, and the amount of manganese powder added is 2% of the mass of the mixed powder; the ball-to-material ratio used for mixing is 0.225:1 , the grinding ball used is a steel ball with a diameter of 16mm;

[0058] Step 2, put the mixed powder obtained in step 1 through a 140 mesh sieve and put it into a latex sleeve, press it into a compact by cold isostatic pressing, and then trim it on a lathe; the pressure of the cold isostatic pressing is 180MPa, The holding time is 10min;

[0059] Step 3, placing the trimmed compact in step 2 in a...

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Abstract

The invention discloses a method for eliminating internal quality defects of a tungsten alloy. The method comprises the following steps of step 1, mixing iron powder or copper powder with tungsten powder, nickel powder and cobalt powder to obtain mixed powder; step 2, pressing the mixed powder into a compact and trimming; step 3, sintering the trimmed compact to obtain an agglomerate; step 4, placing the agglomerate on the top end of a tungsten alloy matrix material with quality defects inside, and sintering to obtain a tungsten alloy sintered compact; step 5, carrying out internal quality ultrasonic flaw detection on the tungsten alloy sintered compact; and step 6, carrying out vacuum heat treatment or quenching treatment on the qualified tungsten alloy sintered compact to obtain the tungsten alloy with eliminated internal quality defects. According to the method for eliminating the internal quality defects of the tungsten alloy provided by the invention, a low-melting-point alloy agglomerate is melted and flows to the inside of the tungsten alloy matrix material through solid-phase diffusion and liquid-phase diffusion, and the defects such as looseness, cracks and the like are eliminated, so that the internal quality problems such as looseness and cracks in the core of a tungsten alloy product during the liquid phase sintering process are solved, and the waste of resources isavoided.

Description

technical field [0001] The invention belongs to the technical field of manufacturing tungsten alloy materials, and in particular relates to a method for eliminating internal quality defects of tungsten alloys. Background technique [0002] Tungsten alloy is an alloy composed of tungsten as the matrix and adding a small amount of Ni, Fe, Cu, Co, Mo, Cr and other elements. Its density is as high as 16.5g / cm 3 ~19.0g / cm 3 , also known as high specific gravity alloy. Due to its high density, high strength, high hardness, good ductility, and good thermal and electrical conductivity, tungsten alloys are widely used in defense industry, aerospace, medical shielding and industrial shielding. With the rapid development of defense industry, shipbuilding industry and medical shielding industry, the demand for large-scale powder metallurgy tungsten alloy products is increasing day by day. However, for large products, especially cylindrical products, due to the "thin shell vault" effe...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/04B22F3/10B22F3/24
CPCB22F1/0003B22F3/04B22F3/1035B22F3/1017B22F3/1007B22F3/24B22F2003/248
Inventor 赵永华刘方舟白磊潘王虎张磊高洋彭媛
Owner XIAN HUASHAN TUNGSTEN PROD CO LTD