Kinetics and Mechanism of a Sintering Process for Macroporous Alumina Ceramics by Extrusion
The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al2O3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sinte...
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| Veröffentlicht in: | Journal of the American Ceramic Society 1998-03, Vol.81 (3), p.781-784 |
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| creator | Wang, Huan-ting Liu, Xing-qin Chen, Fang-lin Meng, Guang-yao Sørensen, O. Toft |
| description | The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al2O3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sintering process can fit the following rate equation: d Y/dt=nK(T)Y(1 ‐ Y)[(1 ‐ Y)/Y]1/n, where Y is the fraction of volume shrinkage. Kinetic parameters, i.e., the average exponent n and the activation energy E for the pore‐forming process, were calculated to be 0.232 and 415.5 kJ/mol, respectively, in the temperature range of 1200‐1400°C. The results also show the equivalence between isothermal sintering and stepwise sintering in alumina. In the latter case the temperature is increased in steps over a period of time. The equivalence is derived from understanding how the sintering rate changes with porosity. The sintering mechanism in different temperature ranges is discussed, with reference to microstructure development. The bend strengths of porous ceramics with different porosities are also presented. |
| doi_str_mv | 10.1111/j.1151-2916.1998.tb02412.x |
| format | Article |
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Toft</creator><creatorcontrib>Wang, Huan-ting ; Liu, Xing-qin ; Chen, Fang-lin ; Meng, Guang-yao ; Sørensen, O. Toft</creatorcontrib><description>The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al2O3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sintering process can fit the following rate equation: d Y/dt=nK(T)Y(1 ‐ Y)[(1 ‐ Y)/Y]1/n, where Y is the fraction of volume shrinkage. Kinetic parameters, i.e., the average exponent n and the activation energy E for the pore‐forming process, were calculated to be 0.232 and 415.5 kJ/mol, respectively, in the temperature range of 1200‐1400°C. The results also show the equivalence between isothermal sintering and stepwise sintering in alumina. In the latter case the temperature is increased in steps over a period of time. The equivalence is derived from understanding how the sintering rate changes with porosity. The sintering mechanism in different temperature ranges is discussed, with reference to microstructure development. The bend strengths of porous ceramics with different porosities are also presented.</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/j.1151-2916.1998.tb02412.x</identifier><identifier>CODEN: JACTAW</identifier><language>eng</language><publisher>Westerville, Ohio: American Ceramics Society</publisher><subject>Applied sciences ; Building materials. Ceramics. 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Toft</creatorcontrib><title>Kinetics and Mechanism of a Sintering Process for Macroporous Alumina Ceramics by Extrusion</title><title>Journal of the American Ceramic Society</title><description>The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al2O3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sintering process can fit the following rate equation: d Y/dt=nK(T)Y(1 ‐ Y)[(1 ‐ Y)/Y]1/n, where Y is the fraction of volume shrinkage. Kinetic parameters, i.e., the average exponent n and the activation energy E for the pore‐forming process, were calculated to be 0.232 and 415.5 kJ/mol, respectively, in the temperature range of 1200‐1400°C. The results also show the equivalence between isothermal sintering and stepwise sintering in alumina. In the latter case the temperature is increased in steps over a period of time. The equivalence is derived from understanding how the sintering rate changes with porosity. The sintering mechanism in different temperature ranges is discussed, with reference to microstructure development. The bend strengths of porous ceramics with different porosities are also presented.</description><subject>Applied sciences</subject><subject>Building materials. Ceramics. Glasses</subject><subject>Ceramic industries</subject><subject>Chemical industry and chemicals</subject><subject>Exact sciences and technology</subject><subject>Miscellaneous</subject><subject>Technical ceramics</subject><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqVkE2vEyEUhidGE-vV_0BujLupcGYYwI2pvbX3W-NHXLgglAGlzkCFmdj-e5m0uQt3sjkh5-E5h7cozgmek3xeb3OhpARBmjkRgs-HDYaawHz_qJgRemo9LmYYYygZB_y0eJbSNl-J4PWs-H7jvBmcTkj5Ft0Z_VN5l3oULFLos_ODic7_QB9j0CYlZENEd0rHsAsxjAkturF3XqGliaqfLJsDWu2HOCYX_PPiiVVdMi9O9az4-n71ZXlZ3n5YXy0Xt6WumSCl3TQac8Y3rYGWGrC0oRwzMG2rVK0oWFtpChUXjNuGYNpi0jYGmK6BEVtVZ8Wro3cXw-_RpEH2LmnTdcqbvKQERhkGMYHn_4DbMEafd5NAmMCNAJ6hN0co_zKlaKzcRdereJAEyyl0uZVT6HJKVk6hy1Pocp8fvzxNUEmrzkbltUsPBgCCRc0y9vaI_XGdOfzHAHm9WK4YJ9lQHg0uDWb_YFDxl2xYxaj8dr-Wn-7frW8uL5hcV38ByEOlRg</recordid><startdate>199803</startdate><enddate>199803</enddate><creator>Wang, Huan-ting</creator><creator>Liu, Xing-qin</creator><creator>Chen, Fang-lin</creator><creator>Meng, Guang-yao</creator><creator>Sørensen, O. 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Glasses</topic><topic>Ceramic industries</topic><topic>Chemical industry and chemicals</topic><topic>Exact sciences and technology</topic><topic>Miscellaneous</topic><topic>Technical ceramics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Huan-ting</creatorcontrib><creatorcontrib>Liu, Xing-qin</creatorcontrib><creatorcontrib>Chen, Fang-lin</creatorcontrib><creatorcontrib>Meng, Guang-yao</creatorcontrib><creatorcontrib>Sørensen, O. 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Toft</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Kinetics and Mechanism of a Sintering Process for Macroporous Alumina Ceramics by Extrusion</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>1998-03</date><risdate>1998</risdate><volume>81</volume><issue>3</issue><spage>781</spage><epage>784</epage><pages>781-784</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><coden>JACTAW</coden><abstract>The paper describes an evaluation of kinetic parameters for sintering from the analysis of stepwise isothermal dilatometry data for the pore‐forming process of macroporous alpha‐Al2O3 ceramics fabricated by extrusion. The experimental results demonstrated that isothermal shrinkage data for the sintering process can fit the following rate equation: d Y/dt=nK(T)Y(1 ‐ Y)[(1 ‐ Y)/Y]1/n, where Y is the fraction of volume shrinkage. Kinetic parameters, i.e., the average exponent n and the activation energy E for the pore‐forming process, were calculated to be 0.232 and 415.5 kJ/mol, respectively, in the temperature range of 1200‐1400°C. The results also show the equivalence between isothermal sintering and stepwise sintering in alumina. In the latter case the temperature is increased in steps over a period of time. The equivalence is derived from understanding how the sintering rate changes with porosity. The sintering mechanism in different temperature ranges is discussed, with reference to microstructure development. The bend strengths of porous ceramics with different porosities are also presented.</abstract><cop>Westerville, Ohio</cop><pub>American Ceramics Society</pub><doi>10.1111/j.1151-2916.1998.tb02412.x</doi><tpages>4</tpages></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals Exact sciences and technology Miscellaneous Technical ceramics |
| title | Kinetics and Mechanism of a Sintering Process for Macroporous Alumina Ceramics by Extrusion |
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