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High strength and toughness low-oxygen molybdenum alloy and preparation method

A molybdenum alloy, high-strength technology, applied in the field of powder metallurgy, can solve the problems of high oxygen content and single performance of molybdenum alloy, and achieve the effect of good comprehensive performance

Active Publication Date: 2018-11-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a high-strength, low-oxygen molybdenum alloy and its preparation method to solve the technical problems of single performance and high oxygen content of the molybdenum alloy in the prior art

Method used

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Examples

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Embodiment 1

[0033] This embodiment provides a high-strength and tough low-oxygen molybdenum alloy, which is made of the following raw materials in parts by weight: 5.0 g of titanium hydride, 0.8 g of zirconium hydride, 0.4 g of magnesium powder, and 0.4 g of calcium powder. The aluminum powder is 0.4g, the carbon powder is 0.4g, and the molybdenum powder is 1000g.

[0034] The preparation method of the high-strength toughness low-oxygen molybdenum alloy of the present embodiment comprises the following steps:

[0035] Step 1, primary mixing: mix according to the formula ratio, mix titanium hydride, zirconium hydride and composite reducing powder with a three-dimensional mixer for 1 hour;

[0036] Step 2, secondary mixing: mix the titanium hydride, zirconium hydride and composite reducing powder with molybdenum powder again for 2-4 hours;

[0037] Step 3, ball milling: put the powder after secondary mixing into a ball mill tank, fill it with argon, and mill it in a low-energy ball mill wi...

Embodiment 2

[0062] This embodiment provides a high-strength and tough low-oxygen molybdenum alloy, which is made of the following raw materials in parts by weight: 5.0 g of titanium hydride, 0.8 g of zirconium hydride, 1.2 g of magnesium powder, and 1.2 g of calcium powder. The aluminum powder is 1.2g, the carbon powder is 1.2g, and the molybdenum powder is 1000g.

[0063] The preparation method of the high-strength and low-oxygen molybdenum alloy of this example is basically the same as that of Example 1.

[0064] The high-strength toughness low-oxygen molybdenum alloy tensile curve of the present embodiment and figure 1 Basically the same, the SEM photo of the high-strength and tough low-oxygen molybdenum alloy of the present embodiment is the same as figure 2 basically the same.

[0065] The room temperature tensile strength of the high-strength and low-oxygen molybdenum alloy prepared in this embodiment is 1223.56MPa, the elongation is 11.2%, and the oxygen content is 198ppm.

Embodiment 3

[0067] This embodiment provides a high-strength and tough low-oxygen molybdenum alloy, which is made of the following raw materials in parts by weight: 5.0 g of titanium hydride, 0.8 g of zirconium hydride, 2 g of magnesium powder, 2 g of calcium powder, and 2 g of aluminum powder. 2g, carbon powder 2g, molybdenum powder 1000g.

[0068] The preparation method of the high-strength and low-oxygen molybdenum alloy of this example is basically the same as that of Example 1.

[0069] The high-strength toughness low-oxygen molybdenum alloy tensile curve of the present embodiment and figure 1 Basically the same, the SEM photo of the high-strength and toughness molybdenum alloy of the present embodiment is the same as figure 2 basically the same.

[0070] The room temperature tensile strength of the high-strength and low-oxygen molybdenum alloy prepared in this embodiment is 1267.56MPa, the elongation is 10.8%, and the oxygen content is 180ppm.

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Abstract

The invention provides a high strength and toughness low-oxygen molybdenum alloy and a preparation method. The high strength and toughness low-oxygen molybdenum alloy is prepared from the following raw materials in parts by weight: 5 to 12 parts of titanium hydride, 0.8 to 1.4 parts of zirconium hydride, 1.6 to 8 parts of compound reducing powder and 1,000 parts of molybdenum powder, wherein the compound reducing powder is mixed powder which is prepared from carbon powder, boron powder and aluminum powder in the mass ratio of 1:1:1. The high strength and toughness molybdenum alloy disclosed bythe invention has good comprehensive performance; the tensile strength at room temperature is greater than 1,200 MPa; and the elongation percentage is greater than 10.0 percent; and the oxygen content is less than or equal to 200 ppm. On one hand, the composite high strength and toughness molybdenum alloy can combine with oxygen so as to effectively reduce the content of a harmful element, namely, oxygen, in a molybdenum system and reduce the segregation in a substrate and the influence of a coarse second phase which is generated with the substrate; and on the other hand, the composite high strength and toughness molybdenum alloy can form coherent or semi-coherent crystallographic relations with the substrate, and a toughening effect is remarkable.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to molybdenum alloys, in particular to a high-strength and tough low-oxygen molybdenum alloy and a preparation method. Background technique [0002] Molybdenum has the advantages of high temperature strength, high melting point, good thermal and electrical conductivity, and good corrosion resistance, so it is widely used in electronic glass sealing materials, nuclear power nuclear fuel cladding materials, heating element heating components, medical equipment rotating anodes, aerospace Mongolia Leather materials, engine nozzles and other important parts. However, molybdenum's low-temperature brittleness severely limits the use of molybdenum alloys, and the main reason affecting low-temperature brittleness is the segregation of oxygen and nitrogen elements and high porosity. Therefore, the development of new molybdenum alloys strengthened by oxygen and nitrogen elements and low porosity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/05C22C1/10
CPCC22C1/045C22C1/05C22C27/04
Inventor 王快社胡卜亮胡平李世磊陈文静夏雨邓洁周宇航
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY