High melting point metal powder, solid propellant and its preparation process using boron powder

Abstract

The invention discloses a high-melting-point metal powder preparation process. By powder feeding of a negative-pressure region in the center of a hollow tungsten cathode, a non-spherical high-melting-point metal particle raw material is fed into a closed, ultra-high-temperature, high-purity and high-speed inert gas surrounded plasma flame center, the high-melting-point metal particle raw material is instantly prepared into high-purity, high-density and high-nodularity spherical high-melting-point metal powder by melting, nodulizing and rapidly quenched solidification, mass content of high-melting-point metal is greater than or equal to 99.99%, relative density is greater than or equal to 99.98%, degree of sphericity is greater than or equal to 0.98%, and nodularity is greater than or equal to 99%. The invention further discloses a solid propellant and a process for preparing the same by using boron powder. By the high-melting-point metal powder preparation process, every non-spherical high-melting-point metal particle can be instantly converted into a high-purity, high-density and high-degree-of-sphericity metal particle, and the quality and the overall performance of the spherical high-melting-point metal powder and the boron powder which are produced by the invention can be at advanced world levels.

Description

technical field [0001] The invention relates to a three-high process for high melting point metal powder, in particular to a three-high spherical boron powder process for solid rocket fuel propellants. Background technique [0002] Boron is a chemical raw material with a wide range of uses. It has important uses in almost all important sectors such as metallurgy, building materials, machinery and electrical appliances, chemical industry, nuclear industry, medicine, agriculture, etc. There are more than 300 products with clear uses on the market. [0003] Elemental boron has two forms, one is crystalline boron, the other is amorphous boron, and the former has poor chemical activity. Elemental boron has a very high melting point, about 2076°C, and a higher boiling point, about 3927°C. Elemental boron can be used as a reducing agent, an oxidizing agent, or a brominating agent. For example, at high temperature, elemental boron can be combined with N 2 , O 2 , S, H 2 Gas reac...

AI Technical Summary

Problems solved by technology

[0012] 1. The melting point of boron is too high, it is difficult to obtain a high-temperature melt of boron with conventional heating and melting equipment

[0013] 2. Due to the strong activity of elemental boron at high melting point, it can produce violent chemical reactions with almost any metal material, such as ceramic materials, graphite and other crucible materials, so it is difficult to obtain high-purity high-temperature elemental boron melt

[0014] 3. Elemental boron powder, especially crystalline elemental boron powder, has very high particle hardness, strength and toughness, and it is difficult to further crush or spheroidize it by means of mechanical ball milling, vibrating ball milling, high-energy stirring ball milling, jet milling, etc., and these method will inevitably introduce a large number of foreign inclusions

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