A special high titanium hydride powder for preparing aluminum foam and its preparation method

Abstract

The invention provides a special high titanium hydride powder for preparing foamed aluminum and a preparation method of the special high titanium hydride powder. For the titanium powder, the angle of repose is not greater than 45 degrees, and the granularity is 0.3-3 microns. The titanium powder comprises the following components in percentage by weight: 89-91.5% of Ti, greater than or equal to 5% of H, 1.5-2.5% of Al2O3, 0.04-0.06% of Mg, 0.5-1% of N, and the balance being inevitable impurities. The invention further aims at providing a preparation method of the special high titanium hydride powder for preparing foamed aluminum. The preparation method comprises the following process steps in sequence: preparing raw materials, performing primary hydrogenation, seeping magnesium and aluminum, nitriding and performing secondary hydrogenation. The foamed aluminum prepared from the titanium powder provided by the invention is high in clearance rate, uniform in pore distribution, relatively large and consistent in aperture and high in pass percent and good rate, solves the technical difficulty that conventional foamed aluminum is hard to achieve industrialization in China, and has the great significance in breaking the blockade on techniques of other countries.

Description

technical field [0001] The invention relates to the field of foaming agents involved in the preparation of foamed aluminum, in particular to a special high-hydrogen titanium powder for preparing foamed aluminum and a preparation method thereof. Background technique [0002] Aluminum foam has both metal and air bubble characteristics. It has low density, high impact absorption ability, high temperature resistance, strong fire resistance, corrosion resistance, sound insulation and noise reduction, low thermal conductivity, high electromagnetic shielding, strong weather resistance, filtering ability, easy processing, easy installation, and high forming accuracy , Can carry out surface coating. The excellent physical properties, chemical properties, mechanical properties and recyclability of aluminum foam make aluminum foam have broad application prospects in today's material field, and it is regarded as one of the most promising engineering materials in the 21st century, espec...

AI Technical Summary

Problems solved by technology

The introduction of foamed aluminum Baidu Encyclopedia and the current status and prospects of production technology mentioned in the article that foamed aluminum is industrialized in the United States, Japan and other developed countries. Although dozens of units in my country are studying the industrialized production of foamed aluminum, they have not developed Foaming agent suitable for the production of foamed aluminum has not yet been put into large-scale production and can produce valuable products.

For example, Chinese patent 201110252119.4 is composed of quicklime and coke, and its composition ratio is 20-40wt% of quicklime, 30-50wt% of coke, and the balance of manganese ore is used as foaming agent to make aluminum foam; Chinese patent 200510200512.3 uses calcium carbonate and sodium bicarbonate powder , silicon carbide, rare earth, magnesium, titanium and silicon, because metal titanium has excellent gas absorption performance, using titanium hydride powder as a foaming agent is also one of the commonly used methods for preparing aluminum foam. The common process of foamed aluminum is to mix aluminum powder or aluminum alloy powder with a small amount of foaming agent, press it into a solid block, and then heat it to a high temperature close to or higher than the melting point of the mixture. During the heating process, the foaming agent decomposes and releases a large amount of foam. Gas (hydrogen) forces the solid block to expand to form a porous aluminum foam material. However, the aluminum foam prepared by the foaming agent has technical problems such as difficult control of the pore size, poor uniform distribution of the pores, and low yield. Solve the problem, resulting in the fact that the production of foamed aluminum in China is still in the experimental stage and cannot realize industrial production. The use of domestic foamed aluminum in the fields of high-speed rail and aviation is still in the trial stage. Therefore, it is necessary to produce a foaming agent suitable for the production of foamed aluminum The realization of industrialization plays an extremely important role in the economic development of our country, and is the key to breaking through the foreign technology blockade and realizing the domestic industrial production of aluminum foam