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

A technology of near-net laser forming and structural parts, which is applied in the direction of ceramic molding machines and manufacturing tools, which can solve the problems of easy generation of pores, cracks, poor surface quality and dimensional accuracy of formed parts, etc., and achieve grain refinement and surface improvement. Quality and dimensional accuracy, crack suppression effect

Active Publication Date: 2016-01-13
DALIAN UNIV OF TECH
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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.

Method used

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

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Embodiment Construction

[0023] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0024] Such as figure 1 As shown, the laser near net shape Al 2 o 3 The method of ceramic thin-walled parts uses Nd:YAG solid-state continuous laser for near-net laser forming, and selects the titanium alloy circular substrate as Al 2 o 3 Forming substrate for ceramic thin-walled parts, high-purity Al 2 o 3 The ceramic powder is used as the molding material, and argon is used as the powder feeding and shielding gas. The specific implementation steps are as follows:

[0025] A, the ultrasonic transducer 7 is positioned on the support 9, and the annular flange on the ultrasonic transducer 7 is pressed by the pressure plate 8, and the ultrasonic transducer 7 is positioned and clamped, and the overall size is selected as Titanium alloy (Ti-6Al-4V) substrate 6 as Al 2 o 3 The forming substrate of the cer...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/00
CPCB28B1/093
Inventor 吴东江郭敏海马广义牛方勇周思雨
Owner DALIAN UNIV OF TECH
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