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Mo-Si-B intermetallic compound rod and preparation method thereof

An intermetallic compound, mo-si-b technology, applied in the field of intermetallic compound preparation, can solve the problems of high oxygen content, difficult to eliminate, reduce the use temperature and reliability of materials, etc., and achieve low oxygen content and reduce sintering. The effect of high temperature and purity

Inactive Publication Date: 2016-01-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Mo-Si-B intermetallic compound prepared by powder metallurgy will inevitably form an unstable phase with a low melting point, which is difficult to eliminate even through high temperature and long-term annealing
In addition, the Mo-Si-B intermetallic compound prepared by powder metallurgy will introduce impurities and high oxygen content, which reduces the mechanical properties and oxidation resistance of the Mo-Si-B intermetallic compound.
Although the oxygen mass content of the Mo-Si-B intermetallic compound prepared by the smelting method is lower than that of the powder metallurgy method, a large number of transition phases are still generated, and the microstructure is dendritic, which reduces the service temperature and reliability of the material

Method used

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  • Mo-Si-B intermetallic compound rod and preparation method thereof

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Effect test

Embodiment 1

[0027] In this embodiment, the Mo-Si-B intermetallic compound rod is made of the following atomic percentages of raw materials: 15% silicon, 30% boron, and the balance is molybdenum and unavoidable impurities.

[0028] The method for preparing the Mo-Si-B intermetallic compound rod in this embodiment comprises the following steps:

[0029] Step 1. Place silicon powder, boron powder and molybdenum powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 35 hours at a speed of 500 rpm and a ball-to-material ratio of 15:1 by mass. After ball milling, Dry under vacuum conditions to obtain mixed powder; the volume of the absolute ethanol is 0.7 times the sum of the mass of silicon powder, boron powder and molybdenum powder, wherein the unit of volume is mL, and the unit of mass is g; The temperature is preferably 95°C. Preferably, the mass purity of the silicon powder is not less than 99%, the mass purity of the boron powder is not less than 99%, and the mass ...

Embodiment 2

[0035] In this embodiment, the Mo-Si-B intermetallic compound rod is made of the following atomic percentages of raw materials: 17% silicon, 35% boron, and the balance is molybdenum and unavoidable impurities.

[0036] The method for preparing the Mo-Si-B intermetallic compound rod in this embodiment comprises the following steps:

[0037] Step 1. Place silicon powder, boron powder and molybdenum powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 42 hours at a speed of 420rpm and a ball-to-material ratio of 20:1 by mass. After ball milling, Dry under vacuum conditions to obtain mixed powder; the volume of the absolute ethanol is 0.5 times the sum of the mass of silicon powder, boron powder and molybdenum powder, wherein the unit of volume is mL, and the unit of mass is g; The temperature is preferably 100°C. Preferably, the mass purity of the silicon powder is not less than 99%, the mass purity of the boron powder is not less than 99%, and the mass ...

Embodiment 3

[0043] The Mo-Si-B intermetallic compound rod in this embodiment is made of the following atomic percentages of raw materials: 13% silicon, 25% boron, and the balance is molybdenum and unavoidable impurities.

[0044] The method for preparing the Mo-Si-B intermetallic compound rod in this embodiment comprises the following steps:

[0045] Step 1. Place silicon powder, boron powder and molybdenum powder in a ball mill, use absolute ethanol as a dispersant, and ball mill for 28 hours at a speed of 580 rpm and a ball-to-material ratio of 10:1 by mass. After ball milling, Dry under vacuum condition, obtain mixed powder; The volume of described dehydrated alcohol is that silicon powder, boron powder and molybdenum powder mass are equal, wherein the unit of volume is mL, and the unit of mass is g; The temperature of described drying is preferably 90°C, preferably, the mass purity of the silicon powder is not less than 99%, the mass purity of the boron powder is not less than 99%, an...

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Abstract

The invention discloses a Mo-Si-B intermetallic compound rod. The Mo-Si-B intermetallic compound rod is prepared by the following raw materials in percentage by atom: 8-17% of silicon, 20-30% of boron, and the balance of molybdenum and inevitable impurities. In addition, the invention further discloses a method for preparing the Mo-Si-B intermetallic compound rod; and the method comprises the following steps: (1) raw materials are dried after ball milling to obtain mixed powder; (2) the mixed powder is pressed to form a blank, and is sintered to obtain a Mo-Si-B intermetallic compound sintered body; (3) the Mo-Si-B intermetallic compound sintered body is smelted by an electronic beam to obtain a Mo-Si-B intermetallic compound ingot, and is cut to form a semi-finished rod; and (4) the semi-finished rod is smelted in an electronic beam area to obtain the Mo-Si-B intermetallic compound rod. The Mo-Si-B intermetallic compound rod has the characteristics of high purity and low oxygen mass content, and is broad in application prospect under an ultrahigh-temperature bad extreme environment.

Description

technical field [0001] The invention belongs to the technical field of intermetallic compound preparation, and in particular relates to a Mo-Si-B intermetallic compound rod and a preparation method thereof. Background technique [0002] The military power represented by the United States relies on its scientific and technological advantages to vigorously develop advanced theater missile systems (TMD) and national missile defense systems (NMD), which pose a great threat to other countries' ballistic missiles. In terms of national defense, our country is now facing severe challenges. Whether it is TMD or NMD, it is difficult to intercept missiles with hypersonic maneuvering flight. Therefore, we must develop and develop a new generation of mid-stage and re-entry hypersonic maneuvering flight capabilities ballistic missile. However, the realization of these goals faces many problems, one of the biggest bottlenecks is the development of ultra-high temperature materials. Ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/02C22C1/05
Inventor 喻吉良张如郑欣李来平张文裴雅王峰蔡小梅郭林江刘辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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