Aluminum oxide/zirconium oxide SLM (selective laser melting) ceramic powder material and preparation method thereof

Abstract

The invention relates to a novel Al2O3 / ZrO2 powder material for SLM (selective laser melting) molding and a preparation method thereof. After molding by laser melting, the powder material forms an oral use Al2O3 / ZrO2 composite ceramic material which has uniform internal tissue structure and has no obvious phase segregation. According to the preparation method, an electro-magnetic induction heating furnace and a laser are used for carry out secondary preheating on a powder bed, after achieving the preset preheating temperature, the powder material is molded by laser melting. The gradient of the interior temperature and the exterior temperature of a molten pool in molding of the ceramic material can be effectively reduced, the interior thermal stress can be lowered, cracks on the surface and in the interior of the material are reduced, and the mechanical property of the material is improved. The SLM Al2O3 / ZrO2 composite ceramic material molded by the powder material through the preparation method has uniform internal tissues, has no phase segregation, has no obvious cracks on the surface and in the interior, has better mechanical property, and is expected to be used as a material of all-ceramic crown, bridge and inlay to be used in clinic of oral repair.

Description

technical field [0001] The invention relates to the field of ceramic materials processed by Selective Laser Melting (SLM), in particular to an aluminum oxide (Al 2 o 3 ) / zirconia (ZrO 2 ) powder of multiphase ceramic material and its preparation method for SLM processing. Background technique [0002] Alumina (Al 2 o 3 ) and zirconia (ZrO 2 ) composite ceramic restorations can reproduce the natural tooth color, have good biological properties, and can bear large chewing loads. The traditional production method adopts powder slurry coating, glass infiltration and sintering, which has problems such as cumbersome process and long processing cycle. At present, the dental CAD / CAM system is mainly used, and the prefabricated mechanically processed ceramic billet is processed by CNC cutting and then sintered. If densely sintered high-strength ceramics are used as the billet, the machinability is poor, the cutting efficiency is low, and the tool wear is large. In order to so...

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Problems solved by technology

However, there are few studies on the processing of ceramic materials using SLM technology. Known studies have found that there will be problems such as composition segregation and molded parts cracking when molding ceramic materials, and the mechanical properties of molded ceramic parts are insufficient.

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