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Method for preparing vacuum hot-pressed beryllium material with diameter greater than 300 mm and beryllium material

A technology of vacuum hot pressing and beryllium materials, which is applied in the field of beryllium materials, can solve the problems of high cost, low pressing efficiency, and low pressing force, and achieve the effects of low pressing cost, high pressing efficiency, and improved material density

Inactive Publication Date: 2020-03-27
西北稀有金属材料研究院宁夏有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a method for preparing a vacuum hot-pressed beryllium material with a diameter greater than 300 mm, so as to solve the technical problems of low pressing force, low pressing efficiency and high cost during the pressing process of small-sized hot-pressed beryllium materials

Method used

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  • Method for preparing vacuum hot-pressed beryllium material with diameter greater than 300 mm and beryllium material
  • Method for preparing vacuum hot-pressed beryllium material with diameter greater than 300 mm and beryllium material
  • Method for preparing vacuum hot-pressed beryllium material with diameter greater than 300 mm and beryllium material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Prepare beryllium powder with a beryllium content of 99.4% by weight, an average particle size of 14 μm, and a total impurity content of 0.5% by weight.

[0025] Step 2: Put the beryllium powder into a mold for baking and then put it into a vacuum hot pressing furnace for pressure sintering;

[0026] The baking temperature is 180°C; baking for 10 hours.

[0027] Process conditions of pressure sintering: vacuum 1×10 -2 Pa began to heat up, the heating rate was 145°C / h, the holding temperature was 1140°C, and the holding pressure was 25MPa / cm 2 , The heat preservation time is 2 hours.

[0028] Step 3: Cooling the pressure-sintered beryllium powder to room temperature and demolding, to obtain a vacuum hot-pressed beryllium material with a diameter of 310 mm.

[0029] The performance parameters of the vacuum hot-pressed beryllium material with a diameter of 310 mm prepared in this embodiment are shown in the following table:

[0030]

Embodiment 2

[0032] Step 1: Prepare beryllium powder with a weight content of 99.8%, an average particle diameter of 10 μm, and a total weight content of 0.1% of impurities.

[0033] Step 2: Put the beryllium powder into a graphite mold with an inner diameter greater than 300mm and bake, then put it into a vacuum hot pressing furnace for pressure sintering;

[0034] The baking temperature is 200°C; the baking time is 15 hours.

[0035] The process conditions of pressure sintering are: vacuum 2×10 -2 Pa began to heat up, the heating rate was 100°C / h, the holding temperature was 1150°C, and the holding pressure was 18MPa / cm 2 , The heat preservation time is 8 hours.

[0036] Step 3: Cooling the pressure-sintered beryllium powder to room temperature and demolding, to obtain a vacuum hot-pressed beryllium material with a diameter of 350 mm.

[0037] The performance parameters of the 350mm diameter vacuum hot-pressed beryllium material prepared in this embodiment are shown in the following table:

[0038]...

Embodiment 3

[0040] Step 1: Prepare beryllium powder with a beryllium content of 99.5% by weight and an average particle size of 11 μm.

[0041] Step 2: Put the beryllium powder into a graphite mold with an inner diameter greater than 300mm and bake, then put it into a vacuum hot pressing furnace for pressure sintering;

[0042] The baking temperature is 220°C; the baking time is 13 hours.

[0043] The process conditions of pressure sintering are: vacuum 3×10 -2 Pa began to heat up, the heating rate was 140°C / h, the holding temperature was 1100°C, and the holding pressure was 22MPa / cm 2 , Heat preservation and pressure keeping time 6 hours.

[0044] Step 3: Cooling the pressure-sintered beryllium powder to room temperature and demolding, to obtain a vacuum hot-pressed beryllium material with a diameter of 330 mm.

[0045] The performance parameters of the vacuum hot-pressed beryllium material with a diameter of 330 mm prepared in this embodiment are shown in the following table:

[0046]

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Abstract

The invention discloses a method for preparing a vacuum hot-pressed beryllium material with a diameter greater than 300 mm, which includes the following steps: 1, preparing beryllium powder with a beryllium weight content greater than 99% and an average particle size of 10 to 14 [mu]m; 2, baking the beryllium powder in a graphite mold with an inner diameter greater than 300 mm, and then placing the beryllium powder in a vacuum hot-pressing furnace for pressure sintering; 3, cooling the pressure-sintered beryllium powder to room temperature and then demolding the same to obtain a vacuum hot-pressed beryllium material with a diameter greater than 300 mm. The invention also discloses a vacuum hot-pressed beryllium material with a diameter greater than 300 mm. The method has the characteristics of high pressing force, a large pressed product diameter , high pressing efficiency and low pressing cost.

Description

Technical field [0001] The invention belongs to the technical field of rare metal powder metallurgy, and relates to a method for preparing a beryllium material with a diameter greater than 300 mm in a vacuum hot-pressed beryllium material and the beryllium material. Background technique [0002] As a rare light metal, beryllium has excellent thermal properties, high rigidity and specific strength, good dimensional stability, low atomic and neutron absorption cross-sections, etc., and is widely used in reactors, nuclear weapons, aerospace industries, and instrumentation aspect. [0003] Due to the specificity and sensitive application fields of beryllium, all countries in the world classify it as a strategic metal, and thus its processing technology and application research are completely blocked, products are not traded, and materials are not reported. In 1974, my country adopted vacuum hot pressing to prepare beryllium products. Due to the limitation of mold material performance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14B22F3/10
CPCB22F3/1007B22F3/14
Inventor 王战宏乔鹏钟景明李志年邵伟张鹏翔王蓓马琨周凯
Owner 西北稀有金属材料研究院宁夏有限公司
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