Prepn process of tantalum-containing carbon-base composite material precursor

Abstract

The preparation process of tantalum-containing carbon-base composite material precursor includes mixing coal tar pitch or petroleum asphalt of softening point of 60-80 deg.c and tantalum chloride in the mass ratio of 100 to 1-20 in inert atmosphere and water-less environment; and reaction at 260-420 deg.c and self pressurizing or 0.3-1.0 MPa pressure while mechanical stirring for 4-10 hr. The preparation process is simple and low in cost, and the tantalum-containing carbon-base composite material precursor may be used as the soaking agent, adhesive or self-sintering material for preparing high performance tantalum-containing carbon-base composite material.

Description

technical field [0001] The invention belongs to a preparation method of tantalum-containing pitch, in particular to a method for preparing tantalum-containing pitch by doping transition metal inorganic salt with pitch as a raw material. Background technique [0002] Carbon materials have remarkable characteristics such as good electrical conductivity, excellent high-temperature strength, excellent thermal shock resistance and chemical stability, and are widely used in high-tech fields such as aerospace and aviation. However, oxidation and ablation will occur in a high temperature oxidizing atmosphere. The rapid development of aerospace technology requires materials to have high mechanical strength, good thermal shock resistance, ablation resistance and oxidation resistance under extreme environments (ultra-high temperature, ultra-vacuum, strong erosion, strong radiation, etc.). [0003] Tantalum carbide has a high melting point (3880°C), high hardness and high chemical stab...

AI Technical Summary

Problems solved by technology

However, the above-mentioned preparation methods have the following disadvantages: long manufacturing cycle, high price, greatly limited size of the prepared material, and weak bonding force between the tantalum carbide layer and the carbon material interface, poor thermal shock resistance at instantaneous high temperature, resulting in easy cracking of the sample , the application is very limited

The use of powder doping can reduce the cost, uniform mixing can eliminate the influence of the interface, and improve the thermal shock resistance. It is an effective means of modification. 2 o 5 : 8.7g / cm 3 ;TaC: 14.4g / cm 3 ) and carbon matrix (3 ) has a large difference in density, and it is difficult to mix evenly by traditional mechanical and physical mixing methods, resulting in easy cracking of the product.