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Setter plate for sintering of high-specific-gravity tungsten alloy and preparation method thereof

A tungsten alloy and high specific gravity technology, which is applied in the field of high specific gravity tungsten alloy sintering setter and its preparation, can solve the problems affecting the normal production of tungsten alloy, and achieve the effects of promoting sintering, improving thermal shock resistance and high melting point

Active Publication Date: 2021-02-19
湖南仁海科技材料发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For stainless steel powder metallurgy products, corundum-mullite and 99 alumina setter plates are often used during sintering, but due to the existence of metal molten phase in the sintering process of high specific gravity tungsten alloys, it is easy to mix with existing materials during sintering The plate is stuck, which affects the normal production of tungsten alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mixing: 50% by weight of fused barium zirconate with a particle size of ≤80 mesh, 30% of fused barium zirconate with a particle size of ≤325 mesh, 14% of fused zirconia with a particle size of ≤1000 mesh, and 6% The barium sulfate micropowder, and the PVA that accounts for the weight percentage composition of raw material is 5% is put into high-speed kneader and mixes homogeneously;

[0023] (2) Molding: The uniformly mixed material is weighed according to the individual weight of the green body, and then poured into the mold for molding;

[0024] (3) Drying: Dry the molded green body naturally for 1 day, and then put it into an electric heating drying kiln for 30 hours at 150°C;

[0025] (4) Firing: After drying, fire at a temperature of 1680°C for 10 hours to obtain setter products for high specific gravity tungsten alloy sintering.

Embodiment 2

[0027] (1) Mixing: 55% by weight of fused barium zirconate with a particle size of ≤80 mesh, 25% of fused barium zirconate with a particle size of ≤325 mesh, 17% of fused zirconia with a particle size of ≤1000 mesh, and 3% The barium sulfate micropowder, and the PVA that accounts for 4% by weight percentage composition of raw material is put into high-speed kneader and mixes homogeneously,

[0028] (2) Molding: The uniformly mixed material is weighed according to the individual weight of the green body, and then poured into the mold for molding;

[0029] (3) Drying: Dry the formed green body naturally for 1 day, and then put it into an electric heating drying kiln for 24 hours at 200°C;

[0030] (4) Firing: After drying, fire at 1700°C for 8 hours to obtain setter products for high specific gravity tungsten alloy sintering.

Embodiment 3

[0032] (1) Mixing: 65% by weight of fused barium zirconate with a particle size of ≤80 mesh, 20% of fused barium zirconate with a particle size of ≤325 mesh, 10% of fused zirconia with a particle size of ≤1000 mesh, 5% The barium sulfate micropowder and the water-soluble resin that accounts for 4% by weight of the raw material are put into a high-speed mixer and mixed uniformly,

[0033] (2) Molding: The uniformly mixed material is weighed according to the individual weight of the green body, and then poured into the mold for molding;

[0034] (3) Drying: Dry the formed green body naturally for 2 days, and then put it into an electric heating drying kiln for 24 hours at 150°C;

[0035] (4) Firing: After drying, fire at 1750°C for 6 hours to obtain setter products for high specific gravity tungsten alloy sintering.

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Abstract

The invention discloses a setter plate for sintering of a high-specific-gravity tungsten alloy and a preparation method thereof. The preparation method comprises the steps: (1) putting raw materials and a binding agent into a high-speed mixing mill to be evenly mixed, wherein the raw materials comprise 50%-65% of electric smelting barium zirconate with the particle size smaller than or equal to 80meshes, 20%-30% of electric smelting barium zirconate with the particle size smaller than or equal to 325 meshes, 10%-20% of electric smelting zirconium oxide with the particle size smaller than or equal to 1000 meshes and 3%-6% of barium sulfate micropowder, wherein the binding agent accounts for 4-6% of the raw materials in percentage by weight; (2) weighing the uniformly mixed materials according to the single weight of a biscuit, and pouring the materials into a mold for molding; (3) naturally drying the formed biscuit for 1-2 days, and then putting the biscuit into an electric heating drying kiln to be dried for 24-30 hours at 150-200 DEG C; and (4) firing for 6-10 hours at the temperature of 1680-1750 DEG C to obtain a setter plate product for sintering of the high-specific-gravitytungsten alloy. The problem of tungsten alloy adhesion is well solved, and the thermal shock resistance of the setter plate is improved.

Description

technical field [0001] The invention relates to a setter plate for high specific gravity tungsten alloy sintering and a preparation method thereof. Background technique [0002] High specific gravity tungsten alloy has the advantages of high density, high strength and hardness, good electrical conductivity, low thermal expansion coefficient, high corrosion resistance and oxidation resistance, etc. It is often used as armor-piercing projectile material, shielding material and contact material, and is widely used in military industry, aerospace, medical treatment and other fields. Tungsten has a high melting point and is difficult to sinter. It is necessary to add a small amount of alloying elements such as Ni, Fe, and Cu. The alloying elements melt at a lower temperature to form a liquid phase to achieve sintering and densification of tungsten alloys. For stainless steel powder metallurgy products, corundum-mullite and 99 alumina setter plates are often used during sintering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/64F27D5/00
CPCC04B35/48C04B35/622C04B35/64F27D5/00C04B2235/6567C04B2235/9607
Inventor 潘建华潘建中
Owner 湖南仁海科技材料发展有限公司