Preparation method for TiC ceramic precursor

Abstract

The invention relates to the technical field of preparation of rare metal materials, specifically to a preparation method for a TiC ceramic precursor. The method comprises the following steps: adding 10 g of tetrabutyl titanate in a small beaker with a volume of 50 mL and adding light yellow transparent DVB into the colorless transparent tetrabutyl titanate drop by drop, wherein DVB immediately turns deep yellow and tetrabutyl titanate and divinyl benzene (DVB) are layered; carrying out stirring in the beaker so as to allow tetrabutyl titanate and DVB to be intermiscible, wherein a solution obtained after stirring is clear and has low viscosity, and layering does not occur when stirring is stopped; pouring the mixed reactant into a test tube, sealing the test tube and carrying out heating in a drying box for crosslinking; and placing a crosslinked sample into a crucible and carrying out pyrolysis in a cracking furnace so as to obtain the TiC ceramic precursor. According to the invention, tetrabutyl titanate and DVB are used as raw materials to prepare the TiC precursor; operation is simple; requirements on equipment are low; the prepared TiC precursor has excellent performance and can be easily preserved; and with increase of cracking temperature, the crystallization degree of TiC increases, which facilitates large-scale promotion of the TiC precursor.

Description

technical field [0001] The invention relates to the technical field of preparation of rare metal materials, in particular to a method for preparing a TiC ceramic precursor. Background technique [0002] Titanium carbide (TIC) has a low density (4.93g / cm 3 ), high melting point (3143°C), high thermal conductivity (7.74×10 -6 K -1 ) and high Young's modulus (470GPa), and has good chemical stability, which makes it possible for it to be used as aircraft nose cone, wing leading edge, engine hot end and other components for long-term supersonic flight and atmospheric reentry , transatmospheric flight and rocket propulsion systems and other extreme environments. At present, various carbide, boride, and nitride ultra-high temperature resistant ceramic materials are mainly prepared by hot pressing process. Due to the high melting point of ceramic raw materials, the sintering temperature is high, and sintering aids are generally added to reduce the sintering temperature. But in g...

AI Technical Summary

Problems solved by technology

But in general, the fracture toughness of hot-pressed materials is low, and it is difficult to sinter and densify ultra-high temperature resistant ceramic materials prepared by hot-pressing sintering process, which requires higher sintering temperature (generally close to 2000°C) and sintering pressure, and high temperature sintering will lead to abnormal grain growth