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Method for preparing molybdenum semi-finished products

A billet and preparation process technology, applied in the field of preparing molybdenum billets, can solve the problems of difficult quality stability, high preparation difficulty, high manufacturing cost, etc.

Inactive Publication Date: 2013-12-11
四川省有色冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that submicron molybdenum powder must be used as raw material, and the preparation difficulty of submicron molybdenum powder is much higher than that of ordinary first-grade molybdenum powder FMo-1, and the quality is difficult to be stable. At the same time, the manufacturing cost is lower than that of FMo-1. much higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: (1) Use a 500g electronic balance with an accuracy of 0.01g to weigh commercially available FMo-1 molybdenum powder with a Fischer particle size of 1.68μm, and control the unit weight to 17.8±0.05g.

[0029] (2) Fill the above-mentioned weighed molybdenum powder evenly into the steel mold with a cavity diameter of φ38.9mm, try to maintain the consistency of the material layer thickness, and then install the punch steadily.

[0030] (3) Apply pressure on the above-mentioned steel mold with molybdenum powder with a total pressure of 40 tons (pressing pressure 350MPa) on the hydraulic press, and hold the pressure for 5 seconds.

[0031] [4] Demoulding to obtain a molybdenum powder compact with a diameter of 38.95-39.10mm and a thickness of 2.60-2.65mm.

[0032] Step 2: (1) The molybdenum powder compacts are carefully packed into the molybdenum sintering boat, and the molybdenum powder compacts and between the compacts and the molybdenum boat are separated by -80+150 mesh dr...

Embodiment 2

[0037] Step 1: (1) Use a 500g electronic balance with an accuracy of 0.01g to weigh commercial FMo-1 molybdenum powder with a Fischer particle size of 1.32μm, and control the unit weight to 5.8±0.02g.

[0038] (2) Fill the above-mentioned weighed molybdenum powder evenly into the steel mold with a cavity diameter of φ22.0mm, try to maintain the consistency of the material layer thickness, and then install the punch steadily.

[0039] (3) Use a total pressure of 15 tons (pressing pressure of 400 MPa) on the hydraulic press to press the steel mold with molybdenum powder, and hold the pressure for 5 seconds.

[0040] [4] Demoulding to obtain a molybdenum powder compact with a diameter of 22.05-22.10mm and a thickness of 2.60-2.65mm.

[0041] Step 2: (1) The molybdenum powder compacts are carefully packed into the molybdenum sintering boat, and the molybdenum powder compacts and between the compacts and the molybdenum boat are separated by -80+150 mesh dry corundum powder to prevent Bond...

Embodiment 3

[0046] Step 1: (1) Use a 5000g electronic balance with an accuracy of 0.5g to weigh the commercially available FMo-1 molybdenum powder with a Fibonacci particle size of 2.15μm, and control the unit weight to 1090±1g.

[0047] (2) Fill the above-mentioned weighed molybdenum powder evenly in a steel mold with a cavity of 163.3×121.0mm, try to maintain the consistency of the material layer thickness, and then install the punch steadily.

[0048] (3) Use a total pressure of 400 tons (pressing pressure about 200MPa) on the hydraulic press to press the steel mold with molybdenum powder, and hold the pressure for 20 seconds.

[0049] [4] Demoulding to obtain a molybdenum powder compact with a size of 163.55-163.80×121.22-121.40mm and a thickness of 9.70-9.80mm.

[0050] Step 2: (1) The molybdenum powder compacts are carefully packed into the molybdenum sintering boat, and the molybdenum powder compacts and between the compacts and the molybdenum boat are separated by -80+150 mesh dry corundu...

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Abstract

The invention relates to a method for preparing molybdenum semi-finished products, in particular to a method for preparing molybdenum semi-finished products in the high density molybdenum product preparation process. The method comprises the preparation steps of (1) conducting compression molding on molybdenum powder, and (2) sintering compacted semi-finished products formed by compression molding. The method is characterized in that continuous high-temperature sintering is carried out in the sintering process under the protection of protective gas. According to the method for preparing the molybdenum semi-finished products, the continuous high-temperature sintering is adopted, activated reducing gas is adopted, the strong activated sintering effect is achieved in the sintering process, molybdenum products with the sintered density as high as 10.0-10.13g / cm<3> are obtained by the molybdenum semi-finished products at the relatively low temperature, and the molybdenum products can be directly used for achieving a number of purposes. As for an application occasions with the high dimensional accuracy requirement, little finish machining can be carried out to meet the requirement.

Description

Technical field [0001] A method for preparing molybdenum blanks relates to a method for preparing molybdenum blanks in the process of preparing high-density molybdenum products. Background technique [0002] Molybdenum is an important rare metal, its abundance in the crust is 7.5×10 -4 % Is a scarce strategic material. It has high melting point, high thermal conductivity, good electrical conductivity, good high temperature strength and high wear resistance, so it has a wide range of applications in many fields such as aviation, aerospace, high temperature structural parts, electronic components, and medical devices. [0003] Due to the high melting point of metallic molybdenum (2620°C), it is difficult to use smelting and casting processes, so the preparation method of molybdenum products usually adopts powder metallurgy. The preparation process adopts molybdenum powder as raw material, and prepares molybdenum billet after pretreatment, molding, high temperature sintering or verti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16
Inventor 张继忠李海英陈金花
Owner 四川省有色冶金研究院有限公司