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A manufacturing process of arc-shaped molybdenum plate for high-life heat shield

A manufacturing process and heat shield technology, which is applied in the manufacturing process of arc-shaped molybdenum plates for high-life heat shields, can solve the problems of heat shield becoming brittle, reducing service life, cracks, etc., and achieve enhanced grain boundary bonding , reduce severe segregation, and improve service life

Active Publication Date: 2018-02-13
LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Heat shields can be divided into three categories: tungsten heat shields, molybdenum heat shields and steel heat shields. After long-term high-temperature use, heat shields are prone to recrystallization, making the heat shield brittle, and then producing cracks, reducing its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A manufacturing process of a curved molybdenum plate for a high-life heat shield, comprising the following steps:

[0025] Step 1. Take nano-alumina hydroxide powder and calcinate it at 500°C for 4 hours to obtain alumina powder; then weigh a certain amount of alumina powder, and add a volume ratio of 0.5:1:4 in sequence with a mass concentration of 65% Concentrated nitric acid, hydrogen peroxide and deionized water with a mass concentration of 30% were stirred for 8 hours and then allowed to stand for 45 minutes. The resulting mixed solution was placed in an autoclave, heated at 160°C for 20 hours, cooled, filtered, and the filtrate was dried. Obtain nano alumina powder for subsequent use; wherein, the ratio of the quality of alumina powder to the volume of concentrated nitric acid is 0.3g: 1mL;

[0026] Step 2. According to the mass ratio of 0.15:1, take the nano-alumina powder and rhenium powder prepared in step 1 in turn, add deionized water to the alumina powder, d...

Embodiment 2

[0035] A manufacturing process of a curved molybdenum plate for a high-life heat shield, comprising the following steps: Step 1: Take nanometer aluminum hydroxide powder and calcinate it at 500°C for 4 hours to obtain alumina powder; then weigh a certain amount of aluminum hydroxide Aluminum powder, add concentrated nitric acid with a mass concentration of 65% at a volume ratio of 0.5:1:4, hydrogen peroxide with a mass concentration of 30% and deionized water, stir for 4 hours and then let stand for 30 minutes, then place the formed mixed solution in the autoclave , heated at 120°C for 16 hours, cooled, filtered, and dried the filtrate to obtain nano-alumina powder for later use; wherein, the ratio of the mass of alumina powder to the volume of concentrated nitric acid was 0.3g: 1mL;

[0036] Step 2. According to the mass ratio of 0.15:1, take the nano-alumina powder and rhenium powder prepared in step 1 in sequence, add deionized water to the alumina powder, disperse under ult...

Embodiment 3

[0044] A manufacturing process of a curved molybdenum plate for a high-life heat shield, comprising the following steps: Step 1: Take nanometer aluminum hydroxide powder and calcinate it at 500°C for 4 hours to obtain alumina powder; then weigh a certain amount of aluminum hydroxide Aluminum powder, add concentrated nitric acid with a mass concentration of 65% at a volume ratio of 0.5:1:4, hydrogen peroxide with a mass concentration of 30% and deionized water, stir for 6.5 hours and then let stand for 50 minutes, and place the formed mixed solution under high pressure In the kettle, heat at 200°C for 15 hours, cool, filter, and dry the filtrate to obtain nano-alumina powder for later use; wherein, the ratio of the mass of alumina powder to the volume of concentrated nitric acid is 0.3g: 1mL;

[0045] Step 2. According to the mass ratio of 0.15:1, take the nano-alumina powder and rhenium powder prepared in step 1 in turn, add deionized water to the alumina powder, disperse for 5...

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Abstract

A manufacturing technology of an arc-shaped molybdenum plate for a long-service-life heat shield specifically comprises the steps of preparing powder A which is of a rhenium-doped nanometer aluminum oxide structure, preparing nanometer lanthanum oxide, preparing the molybdenum plate, preparing a molybdenum blank through the molybdenum plate, and pressing the molybdenum blanket to obtain the targeted arc-shaped molybdenum plate. According to the manufacturing technology, the outward dispersing and oxidizing capacity of molybdenum is reduced through compound elements, so that the oxidizing resistance of molybdenum can be improved, and the service life can be prolonged by more than 30%; in addition, powder metallurgy and mechanical rolling are combined, so that the relative density of the manufactured arc-shaped molybdenum plate is high, and the plasticity is improved, and as a result, cracks can be avoided; an uniform fine grain structure is obtained, and thus physical performance and the mechanical performance can be improved.

Description

technical field [0001] The invention relates to the technical field of heat shields, in particular to a manufacturing process of arc-shaped molybdenum plates for high-life heat shields. Background technique [0002] In addition to using molybdenum crucibles, LED and sapphire melting furnaces also use heat shields. The heat shield is used in the heating furnace to achieve heat insulation and heat preservation based on the principle of reflected radiant heat and interlayer heat resistance. The temperature can be reduced through the heat shield, and the average temperature of each layer of heat shield can be reduced by about 5%. Especially for vacuum heating furnaces, heat shields must be used to prevent contamination of the atmosphere in the furnace and blockage of vacuum tubes and vacuum pumps. Among them, the heat shield is a screen tube composed of multi-layer plates, with up to 15 layers. The surface of the plate is required to be clean, bright, flat, free of ripples and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C27/04C22C32/00C22C30/00B22F3/04B22F3/15B22F3/18C22F1/18
CPCB22F3/04B22F3/15B22F3/18B22F2003/185B22F2998/10C22C1/05C22C27/04C22C30/00C22C32/0031C22F1/18B22F1/0003
Inventor 张灵杰
Owner LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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