Preparation method of self-preheating laser engineered net shaped ZrO2-Al2O3 composite ceramic thin-walled part

Abstract

The invention relates to a preparation method of a self-preheating laser engineered net shaped ZrO2-Al2O3 composite ceramic thin-walled part. The preparation method comprises the following steps: ZrO2 powder and Al2O3 powder are respectively fed in a powder feeder after being dried, and argon is taken as powder feeding gas, and is conveyed in powder nozzles; Nd:YAG continuous laser is transmittedin the powder nozzle through optical fibers to form coaxial laser beams to be irradiated to powder focal points, and the distance between a shower nozzle and a base material is adjusted so as to enable laser to heat melted powder and the base material synchronously; the moving tracks of the powder nozzles are controlled, the moving track of the powder nozzle on the first layer is repeated for 8 to 20 times, the rapid cyclic scanning is carried out by the laser beams, a metal substrate is heated quickly, and after the metal substrate is preheated, ceramic powder and the metal substrate are stably bonded together; and fed powder is formed, and the laser engineered net shaping manufacturing of the ceramic structural part is achieved through laminated accumulation. The invention achieves the crack-free rapid manufacturing from powder to the structural part of the ceramic structural part, needs no auxiliary heating device and binding element addition as well as green ceramic body preparation, and improves the production efficiency.

Description

technical field

[0001] The invention relates to a laser forming technology for ceramic structural parts, in particular to a self-preheating laser forming ZrO 2 -Al 2 o 3 Composite ceramic thin-walled parts method. Background technique

[0002] With the rapid development of the world's industrial level and advanced manufacturing technology, the service life requirements of key components in special environments continue to increase, and the performance of metal materials in high-temperature corrosion, insulation and high-wear environments has been difficult to meet the requirements, such as aerospace High wear and high temperature resistant impellers of engines, manipulators for extreme industrial and mining conditions, special parts for national defense and high-tech fields, etc. Due to its wide range of sources, and its unique properties of wear resistance, corrosion resistance, high hardness and high temperature resistance, ceramic materials have attracted much attentio...

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