Laser near-net forming method for ZrO2 and SiC compound mixed toughening Al2O3 base ceramic piece

Abstract

The invention discloses a laser near-net forming method for a ZrO2 and SiC compound mixed toughening Al2O3 base ceramic piece. Al2O3 ceramic powder with a certain proportion of ZrO2 and SiC powder is formed in a laser near-net mode through a laser rapid forming system. The laser near-net forming method comprises the steps of mixing a certain proportion of ZrO2 and SiC ceramic powder with Al2O3 powder, drying the ZrO2 and SiC ceramic powder and the Al2O3 powder, sending the ZrO2 and SiC ceramic powder and the Al2O3 powder to a powder feeder, connecting a laser processing head and a laser through transmission fibers or a battery of lenses, regarding inert gas as powder feeding and protective gas, controlling the laser processing head to continuously move through a numerical control program, and achieving laser near-net forming of a multiphase ceramic piece on a substrate. According to a superimposed effect of a phase transformation toughing effect of ZrO2 and a mixed toughening effect of SiC particles, microstructures of materials are effectively improved, and a fracture toughness property of Al2O3 materials is synergistically improved.

Description

technical field [0001] The present invention relates to a kind of ZrO 2 / SiC composite doping toughened Al 2 o 3 Laser near-net-shaping method for ceramic-based parts aimed at suppressing Al 2 o 3 Crack generation and propagation during laser near-net forming of ceramic structural parts. Background technique [0002] With the rapid development of the world's industrial level and advanced manufacturing technology, the service life requirements of structural parts 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 engines. High wear and high temperature resistant impellers, 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 an...

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Problems solved by technology

[0010] First of all, although relevant literature reports that laser forming of certain ceramic materials can be achieved by optimizing process parameters, such process parameters often have great limitations, which limits the efficiency of laser rapid prototyping systems

[0011] Secondly, most research results show that substrate preheating can effectively inhibit the generation and propagation of cracks during processing, but this method increases the complexity and cost of the forming process on the one hand, and also increases the difficulty of forming large-scale structural parts

[0012] Finally, the subsequent thermal insulation heat treatment has limited effect on crack elimination and will seriously affect the dimensional accuracy of formed parts

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