Silicon carbide fiber reinforced aluminium phosphate ceramic-based composite and preparation method thereof

Abstract

The invention relates to a silicon carbide fiber reinforced aluminium phosphate ceramic-based composite and a preparation method thereof. The silicon carbide fiber reinforced aluminium phosphate ceramic-based composite comprises the following components in percentage by mass of 40% of silicon carbide fiber cloth, 45%-55% of an aluminium phosphate basal body, and 5%-15% of a polyimide resin basal body. The preparation method comprises the preparation steps of putting silicon carbide fiber cloth in a polyamic acid solution for immersing for 10-30min after the silicon carbide fiber cloth is degummed and dried, then taking out the immersed silicon carbide fiber cloth, and performing solidifying to obtain the silicon carbide fiber cloth containing an oxidation resistant coating; uniformly coating an aluminium phosphate sizing agent onto the outer surfaces of the silicon carbide fiber cloth containing the oxidation resistant coating, then stacking up the silicon carbide fiber cloth coated with the aluminium phosphate sizing agent, and then performing vacuum immersing and die pressing, so that the silicon carbide fiber reinforced aluminium phosphate ceramic-based composite is obtained. The combination effect of fibers and the basal body is good, so that the intensity and the tenacity of the composite are improved, and under the high-pressure oxygen-free environment, the composite canalso maintain high mechanical properties.

Description

technical field [0001] The invention belongs to the field of composite ceramic materials, in particular to a silicon carbide fiber reinforced aluminum phosphate ceramic matrix composite material and a preparation method thereof. Background technique [0002] Fiber-reinforced aluminum phosphate matrix composites have the advantages of high temperature resistance, oxidation resistance, and small thermal expansion coefficient. In the past many years, as an excellent high temperature resistant wave-transmitting composite material, it has been widely used in the fields of missiles, rockets, and aerospace. Applications. At home and abroad, quartz fibers are usually used as reinforcements to prepare quartz [0003] Fiber-reinforced phosphate composites are used in the manufacture of high temperature resistant materials. Beginning in the early 1960s, the U.S. Naval Aviation Bureau funded General Electric to start researching low-cost phosphate high-temperature radome materials, an...

AI Technical Summary

Problems solved by technology

However, in phosphate-reinforced quartz fiber composites, due to the strong corrosiveness of phosphate to silica, the quartz fiber without surface coating will react with quartz to generate silicic acid during the phosphate curing process due to high temperature and acidic conditions. , severely corrodes the quartz fiber, resulting in a serious decline in the mechanical properties at room temperature and high temperature

[0004] In order to improve this situation, the patent CN 103265186A proposes to use thermosetting phenolic resin as the anti-corrosion coating treatment agent on the surface of quartz fiber, and then use the treated quartz fiber as the base material, use aluminum dihydrogen phosphate as the resin, and alumina as the curing agent , the phosphate-reinforced quartz fiber composite material prepared according to methods known in the art has a bending strength of 220MPa-320MPa at room temperature, and a bending strength of 82MP-124MPa at 500°C. It has excellent mechanical properties at room temperature and high temperature, and good heat resistance. However, Due to the low strength of quartz fiber (about 70N), the softening point is 1200°C, so the quartz fiber reinforced aluminum phosphate material also has the problem of low strength.

Patent CN 102124574A discloses a carbon fiber reinforced phosphate composite material molding process, by putting carbon fiber or fiber fabric into phenolic resin, then curing at high temperature (800-1200°C) to form an anti-oxidation coating, and then using it to prepare carbon fiber reinforced phosphoric acid Salt composite material, the bending of the composite material at room temperature can reach more than 210MPa, and it can still reach 50MPa under the condition of 1000°C aerobic environment for 5 minutes. However, the oxidation resistance of carbon fiber is weak, and the preparation of the coating requires high temperature treatment, which is troublesome.

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