Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention provides a mullite-whisker-reinforced anorthite porous ceramic and a preparation method thereof. The preparation method comprises the following steps: preparing pure-phase high-length-diameter-ratio high-dispersibility mullite whisker by a solid reaction process, preparing a porous ceramic billet from the mullite whisker, alpha-aluminum oxide, silicon dioxide and calcium carbonate powder by a foam gelcasting process, and finally, sintering at 1450 DEG C for 5 hours to obtain the mullite-whisker-reinforced anorthite porous ceramic. The material prepared by the method has the advantages of high porosity, low thermal conductivity and high strength. The apparent porosity of the sample, in which the addition amount of the mullite whisker is 50 wt.%, is up to 90%; the room-temperature vacuum thermal conductivity is only 0.045 W/m.K; and the compression strength is up to 1.1 MPa. The research shows that the added mullite whisker inhibits the growth of the anorthite grains, and the high porosity, complicated pore structure and fine grains are main reasons for low thermal conductivity. The tight combination between the added whisker and base greatly enhances the strength of the material.
The invention provides a mullite-whisker-reinforced anorthite porous ceramic and a preparation method thereof. The preparation method comprises the following steps: preparing pure-phase high-length-diameter-ratio high-dispersibility mullite whisker by a solid reaction process, preparing a porous ceramic billet from the mullite whisker, alpha-aluminum oxide, silicon dioxide and calcium carbonate powder by a foam gelcasting process, and finally, sintering at 1450 DEG C for 5 hours to obtain the mullite-whisker-reinforced anorthite porous ceramic. The material prepared by the method has the advantages of high porosity, low thermal conductivity and high strength. The apparent porosity of the sample, in which the addition amount of the mullite whisker is 50 wt.%, is up to 90%; the room-temperature vacuum thermal conductivity is only 0.045 W/m.K; and the compression strength is up to 1.1 MPa. The research shows that the added mullite whisker inhibits the growth of the anorthite grains, and the high porosity, complicated pore structure and fine grains are main reasons for low thermal conductivity. The tight combination between the added whisker and base greatly enhances the strength of the material.
Mullite-whisker-reinforced anorthite porous ceramic and preparation method thereof
30.12.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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