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High-strength and high-toughness molybdenum alloy and preparation method thereof

A high-toughness molybdenum and high-strength technology, applied in the field of powder metallurgy, can solve the problems of low-temperature brittleness and high-temperature oxidation resistance, and limit the use of molybdenum alloys, and achieve the effects of easy control, reasonable design and simple process

Inactive Publication Date: 2012-07-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low-temperature brittleness and high-temperature oxidation resistance of molybdenum and molybdenum alloys, the wider use of molybdenum alloys as structural materials is limited.

Method used

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  • High-strength and high-toughness molybdenum alloy and preparation method thereof
  • High-strength and high-toughness molybdenum alloy and preparation method thereof
  • High-strength and high-toughness molybdenum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh La 2 o 3 10g, ZrH 2 11g, TiH 2 5.4g, carbon powder 0.6g, Si powder 5g, B powder 10g, molybdenum powder 1kg;

[0024] TiH 2 , ZrH 2 , C, Si, and B powders were mixed in a three-dimensional mixer for 2 hours, and then added La 2 o 3 Powder, milled for 6 hours with a planetary ball mill, the ball-to-material ratio is 1:10, and the rotating speed is 220r / min;

[0025] (2) The alloy powder after ball milling is subjected to isostatic pressing with a pressure of 5.0t / cm 2 , the holding time is 30s, pressed into a billet;

[0026] (3) The blank was sintered at 1900° C., the atmosphere was vacuum, and segmented sintering was adopted. The sintering time was 17 hours and cooled with the furnace to obtain a high-strength and high-toughness sintered molybdenum alloy material.

[0027] The high-strength and high-toughness molybdenum alloy stress-strain curve figure and scanning electron microscope photo prepared by the present embodiment are as follows respecti...

Embodiment 2

[0029] (1) Weigh La 2 o 3 8g, ZrH 2 10g,TiH 2 6g, C powder 0.8g, Si powder 4g, B powder 7g, molybdenum powder 1kg;

[0030] TiH 2 , ZrH 2 , C, Si, B powder and molybdenum powder were mixed in a three-dimensional mixer for 3 hours, and then added La 2 o 3 Powder and 100mL alcohol, after stirring evenly, dry at 200°C for 8 hours;

[0031] (2) Ball milling with a planetary ball mill for 8 hours, the ball-to-material ratio is 1:10, and the rotating speed is 220r / min;

[0032] (3) The alloy powder is pressed into shape by cold isostatic pressing, and the pressure is 4.0t / cm 2 , the holding time is 1min, and pressed into a billet;

[0033] (4) The blank was sintered at 2100° C., the atmosphere was hydrogen, and sintered in sections for 20 hours, and cooled with the furnace to obtain a high-strength and high-toughness sintered molybdenum alloy material.

[0034] The high-strength and high-toughness sintered molybdenum alloy material obtained above is further rolled, the ...

Embodiment 3

[0036] (1) Weigh La 2 o 3 9g, ZrH 2 12g, TiH 2 5g, C powder 0.5g, Si powder 6g, B powder 8g, molybdenum powder 1kg;

[0037] TiH 2 , ZrH 2 , C, Si, B powder and molybdenum powder are mixed, mixed in a three-dimensional mixer for 10 hours, and then mixed with La 2 o 3 Powder and 100mL alcohol, stir evenly, and then dry at 150°C for 8 hours;

[0038] (2) ball milling with a high-energy ball mill for 2 hours, the ball-to-material ratio is 1:10, and the rotating speed is 500r / min;

[0039] (3) The alloy powder is molded with a pressure of 3.0t / cm 2 , the holding time is 2min, pressed into a billet;

[0040] (4) The blank was sintered at 2400° C., the atmosphere was inert gas, and segmented sintering was adopted for 10 hours, and then cooled with the furnace to obtain a high-strength and high-toughness sintered molybdenum alloy material.

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Abstract

The invention discloses high-strength and high-toughness molybdenum alloy. Doped alloy elements of Ti, Zr, Si and B and rare earth elements of La are mixed by a solid-solid or solid-liquid mixing method, pre-alloy powder with uniform particles is prepared through mechanical ball milling or high-energy ball milling, the alloy powder after the ball milling is subjected to high-temperature sinteringafter being pressed and formed, and high-strength and high-toughness molybdenum alloy materials are obtained. The molybdenum alloy prepared by the method provided by the invention has high tensile strength, high elongation and high recrystallization temperature, and in addition, excellent high-temperature oxidation resistance performance is realized, so wide application prospects and popularization values are realized.

Description

technical field [0001] The invention and the field of powder metallurgy relate to a molybdenum alloy, in particular to a high-strength and high-toughness molybdenum alloy and a preparation method thereof. Background technique [0002] Since the metal molybdenum was discovered in 1778, molybdenum, as a rare metal with important strategic significance, has the advantages of high melting point, high strength, high hardness, wear resistance and good thermal and electrical conductivity. Corrosion performance is good, so it is widely used in metallurgy, machinery, petroleum, chemical industry, national defense, aerospace, electronics, nuclear industry and many other fields. However, due to the low-temperature brittleness and high-temperature oxidation resistance of molybdenum and molybdenum alloys, the wider use of molybdenum alloys as structural materials is limited. Therefore, research and development of new molybdenum alloys with excellent performance, improvement of molybdenu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/05C21D8/02C21D8/06
Inventor 王快社胡平康轩齐王鹏洲何欢承张兵张郑
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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