Preparation method of self-preheating laser engineered net shaped ZrO2-Al2O3 composite ceramic thin-walled part
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A zro2-al2o3, laser forming technology, applied in the field of laser forming, can solve the problems of slow heating process, complicated heating device and high cost, and achieve the effect of dense ceramic structure, few preparation processes and short manufacturing cycle
Active Publication Date: 2012-10-03
DALIAN UNIV OF TECH
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Through literature analysis, ceramic materials can exhibit certain plasticity after reaching a certain temperature. Therefore, preheating the base material is considered to be one of the most beneficial methods to eliminate cracks. At present, heating furnace or gas flame or electromagnetic induction is generally used. Heating, the heating process of these methods is slow, the heating range is too large, it is easy to oxidize the substrate in a large area, the heating device is complica
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Embodiment 1
[0038] As shown, the self-preheated laser shaped ZrO 2 -Al 2 o 3 Composite ceramic thin-walled method, the embodiments of the present invention require: ZrO 2 -Al 2 o 3 The composite ceramic thin-walled parts are 16 mm in length, 2.5 mm in width and 6 mm in height, and the ZrO 2 -Al 2 o 3 The composite powder is laser formed, and the specific forming steps are as follows:
[0039] A. Select 42 ~ 90 μm spherical ZrO as required 2 (including 8wt.%Y 2 o 3 ) powder and Al 2 o 3 (Containing 13wt.%TiO 2 ), put the powder into an electric blast drying oven and dry at 100 °C for 4 hours;
[0040] B. Before processing, the substrate 6 is polished with sandpaper and cleaned with alcohol;
[0041] C. Put the dried powder into the two cylinders of the powder feeder 7 respectively, and adjust the working distance between the bottom end of the nozzle 3 and the surface of the substrate 6 to 9 mm;
[0042] D. Adjust the laser processing parameters: the laser power is 236 W, the...
Embodiment 2
[0046] As shown, the self-preheated laser shaped ZrO 2 -Al 2 o 3 Composite ceramic thin-walled method, the embodiments of the present invention require: ZrO 2 -Al 2 o 3 The composite ceramic thin-walled parts are 16 mm in length, 2.3 mm in width and 6 mm in height, and the ZrO 2 -Al 2 o 3 The composite powder is laser formed, and the specific forming steps are as follows:
[0047] A. Select 42 ~ 90 μm spherical ZrO as required 2 (including 8wt.%Y 2 o 3 ) powder and Al 2 o 3 (Containing 13wt.%TiO 2 ), put the powder into an electric blast drying oven and dry at 100 °C for 4 hours;
[0048] B. Before processing, the substrate 6 is polished with sandpaper and cleaned with alcohol;
[0049] C. Put the dried powder into the two cylinders of the powder feeder 7 respectively, and adjust the working distance between the bottom end of the nozzle 3 and the surface of the substrate 6 to 9 mm;
[0050] D. Adjust the laser processing parameters: the laser power is 200 W, the...
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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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