A method for near-net-shaping al2o3 ceramic structural parts by laser

Abstract

The invention belongs to the technical field of laser quick forming of ceramic materials, and provides a laser near-net forming method for preparing a Al2O3 ceramic structural part. An ultrasonic transducer is positioned and clamped, a forming base body of the Al2O3 ceramic structural part is clamped at the end of the ultrasonic transducer through a center hole in the forming base body and the end face, and an ultrasonic vibration system is fixed to a work table of a numerical control tool. An ultrasonic generator is started, resonance frequency of the ultrasonic vibration system is searched in the frequency range of 17-23 kHz, a resonance point fittest with output waveform characteristics is selected, and the ultrasonic generator works for 1-5 min under 50-100 W. The ceramic structural part is formed, then a laser device and a powder sending device are sequentially shut off, the frequency of the ultrasonic generator is adjusted to be higher than the resonance frequency of 0.3-5 kHz, ultrasonic output power keeps unchanged, and the ultrasonic generator is shut off after delay of 2-5 min. Surface quality and size precision of the ceramic forming part can be improved, the microstructure is improved, holes, cracks and other defects are prohibited, and the feasible process range of the ceramic structural part formed in the laser near-net forming method is extended.

Description

technical field [0001] The invention belongs to the technical field of laser rapid forming of ceramic materials, and relates to a laser near net forming Al 2 o 3 Method for ceramic structural parts. Background technique [0002] Laser near-net shaping is an advanced manufacturing method that uses high-energy laser beams to directly shape the target structure. The formed parts have fine microstructure, high compactness, hardness and corrosion resistance, and have broad applications in the direct manufacturing and remanufacturing of ceramic materials. Application prospects. Ceramics have high mechanical strength, high insulation resistance, high hardness, wear resistance, corrosion resistance and high temperature resistance. Insulating ceramic sleeves for optical cables, high-temperature ceramic combustion chambers for spacecraft, etc.) have been widely used. [0003] BallaVK, BoseS, BandyopadhyayA, Processingofbulkaluminaceramicsusinglaserengineerednetshaping[J], Internat...

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Problems solved by technology

[0006] The present invention solves the problem of laser near-net shape Al 2 o 3 In the process of ceramic structural parts, the surface quality and dimensional accuracy of the formed parts are poor, and defects such as pores and cracks are prone to occur. A new method for laser near-net forming of ceramic structural parts is proposed.

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