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Preparation method of low-oxygen MHC alloy and application of low-oxygen MHC alloy

A technology of alloying and mixing raw materials, applied in metal processing equipment, manufacturing tools, non-light-emitting electrode manufacturing and other directions, can solve the problem of high oxygen content in MHC alloys, and achieve the effects of strong normal temperature toughness, remarkable strengthening effect and stable performance.

Inactive Publication Date: 2011-05-04
XIAN GEMEI METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a method for preparing a low-oxygen MHC alloy and its application, which mainly solves the problem of high oxygen content in the MHC alloy prepared by powder metallurgy

Method used

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  • Preparation method of low-oxygen MHC alloy and application of low-oxygen MHC alloy
  • Preparation method of low-oxygen MHC alloy and application of low-oxygen MHC alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0027] 1) Raw material selection

[0028] Take the industrial molybdenum powder with the Fischer particle size of 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 18 μm, 24 μm, 30 μm, 40 μm, and 50 μm, and the hafnium hydride powder with the Fischer particle size of 3 μm to 10 μm, and the Fischer particle size of 0.1 μm ~3 μm carbon black. The added mass of hafnium hydride powder is 1.20%, the added mass of carbon black powder is 0.15%, and the rest is molybdenum powder. Mix the selected molybdenum powder, hafnium hydride powder and carbon black powder evenly.

[0029] 2) Raw material molding

[0030] The raw materials uniformly mixed in the step 1) are subjected to static pressure molding under a pressure of 220 MPa to 300 MPa to obtain a blank, and the size of the blank is Φ120mm×130mm.

[0031] 3) Raw material sintering

[0032] Sinter the shaped billet in a hydrogen protective atmosphere. The sintering temperature is shown in the table below. The size of the billet after sinteri...

Embodiment b

[0035] 1) Raw material selection

[0036] Take the industrial molybdenum powder with the Fischer particle size of 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 18 μm, 24 μm, 30 μm, 40 μm, and 50 μm, and the hafnium hydride powder with the Fischer particle size of 3 μm to 10 μm, and the Fischer particle size of 0.1 μm ~3 μm carbon black. The added mass of hafnium hydride powder is 1.00%, the added mass of carbon black powder is 0.13%, and the rest is molybdenum powder. Mix the selected molybdenum powder, hafnium hydride powder and carbon black powder evenly.

[0037] 2) Raw material molding

[0038] The raw materials uniformly mixed in the step 1) are subjected to static pressure molding under a pressure of 220 MPa to 300 MPa to obtain a blank, and the size of the blank is Φ120mm×130mm.

[0039] 3) Raw material sintering

[0040] Sinter the shaped billet in a hydrogen protective atmosphere. The sintering temperature is shown in the table below. The size of the billet after sinteri...

Embodiment c

[0043] 1) Raw material selection

[0044] Take the industrial molybdenum powder with the Fischer particle size of 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 18 μm, 24 μm, 30 μm, 40 μm, and 50 μm, and the hafnium hydride powder with the Fischer particle size of 3 μm to 10 μm, and the Fischer particle size of 0.1 μm ~3 μm carbon black. The added mass of hafnium hydride powder is 0.62%, the added mass of carbon black powder is 0.10%, and the rest is molybdenum powder. Mix the selected molybdenum powder, hafnium hydride powder and carbon black powder evenly.

[0045] 2) Raw material molding

[0046] The raw materials uniformly mixed in the step 1) are subjected to static pressure molding under a pressure of 220 MPa to 300 MPa to obtain a blank, and the size of the blank is Φ120mm×130mm.

[0047] 3) Raw material sintering

[0048] Sinter the shaped billet in a hydrogen protective atmosphere. The sintering temperature is shown in the table below. The size of the billet after sinteri...

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Abstract

The invention provides a preparation method of a low-oxygen MHC alloy. The method comprises the following steps of: 1) selecting raw materials, namely uniformly mixing industrial molybdenum powder of which the Fisher particle size is 4 mu m to 50 mu m, hafnium-containing power of which the Fisher particle size is 3 mu m to 10 mu m and elementary carbon of which the Fisher particle size is 0.1 mu m to 3 mu m in a certain mass ratio; 2) molding the raw materials, namely treating the mixed raw materials under the pressure of 100 and 300MPa to obtain a molded blank; and 3) sintering the raw materials, namely sintering the molded blank in an environment of vacuum, hydrogen or inert gas and at the temperature of between 1,800 and 2,300 DEG C for 5 to 15 hours to obtain the low-oxygen MHC alloy. By the method, the problem that the MHC alloy prepared by a powder metallurgy method contains high oxygen is solved. The low-oxygen MHC alloy prepared by the method can be applied to the preparation of X-ray tube rotating anode targets, composite target base targets, high-temperature crucibles, hot-forged dies and high-temperature ceramic pads.

Description

technical field [0001] The invention relates to a method for preparing a low-oxygen MHC alloy by a powder metallurgy method and an application of the low-oxygen MHC alloy. The oxygen content of the MHC alloy prepared by the method can be as low as 20 ppm or less, and can optimally reach 1 ppm. Background technique [0002] MHC alloy (Molybdenum-Hafnium-Carbon Alloy) is a high-temperature molybdenum-based alloy, and it is also an important high-temperature alloy in commercial use. Due to the good high-temperature performance of MHC alloys, they are widely used in industries such as medical equipment, aerospace, electronics, and glass-ceramic manufacturing. [0003] Studies have shown that the plasticity-brittle transition temperature, recrystallization temperature and toughness of MHC alloys are all related to the oxygen content. Oxygen in the MHC alloy is easy to combine with the strengthening element hafnium. The oxide particles of hafnium are large and difficult to disper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C27/04B21J13/02H01J35/10H01J9/14C04B35/622
Inventor 陈兴友朱宇春秋乾袁新兵杨新春甘涛薛亚兴
Owner XIAN GEMEI METAL MATERIAL
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