A prestressed microcrystalline ceramic liner and its production method

Abstract

The invention discloses a prestressed microcrystalline ceramic liner and a production method thereof, comprising the steps of: 1) using the existing formula technology of sintering microcrystalline ceramics by a low-temperature fusion method to prepare low-temperature sintered microcrystalline ceramic blocks, and adopting the technology of the foundry industry; Lost foam technology, the lost foam is made into a grid shape, and then the low-temperature sintered microcrystalline ceramic plate is placed in the space of the lost foam to ensure that there is no other substance between the microcrystalline ceramic plate and the lost foam; 2) After melting the alloy steel , the temperature of the molten iron is controlled at 1550-1680 degrees, and it is poured into the lost foam. The high-temperature molten iron at 1650 degrees melts the lost foam. At this time, the part of the molten iron in contact with the microcrystalline ceramic plate produces a liquid phase. The liquid phase gradually infiltrates from the contact surface, and when the temperature is less than 800 degrees, the liquid phase generation and sintering stop completely; 3) When the metal in the lost foam is completely cooled to room temperature, due to the shrinkage rate of the cast steel is about 1%, and then formed Prestressed microcrystalline ceramic lining.

Description

technical field [0001] The invention belongs to the technical field of metal-ceramic composites, and in particular relates to a prestressed microcrystalline ceramic liner and a production method thereof. Background technique [0002] Microcrystalline ceramics have the advantages of wear resistance, corrosion resistance, temperature resistance and high hardness, which are excellent properties that other metals and organic materials cannot have at the same time, but microcrystalline ceramics have poor impact resistance and thermal and thermal shock resistance. , which are microcracks caused by process "defects" in the production process of microcrystalline ceramics (glass ceramics, wear-resistant ceramics and cermets), so when the microcrystalline ceramics are subjected to compressive stress, the microcracks will close or appear The slow expansion in the steady state increases the compressive strength and impact strength, and the tensile strength of microcrystalline ceramics i...

AI Technical Summary

Problems solved by technology

According to the damage mechanism of the raw material warehouse, the present invention develops the prestressed microcrystalline ceramic composite liner, which mainly solves the problem of impact cracking and corrosion. Since the composite liner is composed of metal and microcrystalline ceramics, the toughness of the metal is good. It mainly plays the role of impact resistance, and when the microcrystalline ceramics obtains precompression stress, its impact strength can be significantly improved; the role of microcrystalline ceramics is anti-corrosion and wear resistance, especially to protect the metal plate from being impacted. will bend

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