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Study on Gelcasting Forming Process of ZrO2

Author: WangPeiPei
Tutor: DaiJinHui
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: zirconia gelcasting process microwave solidification
CLC: TQ174.6
Type: Master's thesis
Year: 2009
Downloads: 250
Quote: 4
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Abstract


The ceramics of zirconia is one of the engineering ceramics with outstanding performance, it has attracted much attention of material scientists to research deeply for a long time. It can be show that the hotspots of the forming technique research of zirconia go through for recent 20 years like other engineering ceramics. The gelcasting forming process of zirconia was investigated in this paper against the background of research for water pump impeller of zirconia ceramics with high corrosion-resistant.Preparation of suspensions with low viscosity and high solid volume fraction is a key technology for the gelcasting process of ceramics, namely. In the work, the suspensions in the water system were prepared by the acrylamide[CH3CONH2] （AM）, N,N’-methylene bisacrylamide[C7H10N2O2] （MBAM） and E80 as a monomer, a coupling agent and a dispersant, respectively. Influences of the solid volume, dispersant amount, pH and monomer concentration on the rheological properties were investigated. The result indicated that E80 can disperse zirconia powders in the monomer solution adequately; the suspension with 50vol.% high solid volume and 300mPa·s low-viscosity was achieved in the premix with the the ratio of AM to MBAM was 17:1, （AM+MBAM） to water was 18:85, respectively, the E80 in 0.3% out of the suspension weight and pH in 10.5.Gelation behavior of the suspensions with 50vol.% zirconia were studied by the traditional gelling conditions and microwave treatment in the condition that APS is used as initiator and TEMED as catalyst. The influences of initiator, catalyst and gelling temperature on the gelling time were investigated in the traditional gelling conditions. It shows that high stable and low-viscosity zirconia suspensions was achieved at ambient temperature when initiator addition is less than 1 %, volume content of catalyst is between 0.4% and 0.5% gelling temperature is 60℃, the gelling time can be controlled in 20-30mintues in the case of gelling temperature is 60℃. The zirconia ceramics body of water pump impeller was prepared successfully with the 50vol.% zirconia suspensions.The effects of microwave treatment time and microwave power on the solidification time of slurry were discussed using the isopyknic suspension irradiated by microwave with different power in the case of the amount of initiator and catalyst keeping the same ratio as the traditional solidification and the mechanical property of the green body were also analyzed. The experimental results show that microwave power greatly affected the gelation time and the intensity of the green body. The green body of ceramics with high density and strength were achieved in the proper delivered power. The solidified technics with microwave treatment can reduce the gelation time effectively compared to traditional gelling conditions. The microvave treatment was double action （heating and initiating radical） in the process of gelation and was propitious to polymerization of the organic monomer quickly and equably.

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