AlN ceramics were prepared by plasma activation sintering(PAS)with compound additives yttrium acetylacetonate(Y(acac)_(3))and melamine(C_(3)H_(6)N_(6)).The effects of compound additives on the microstructure,density,a...AlN ceramics were prepared by plasma activation sintering(PAS)with compound additives yttrium acetylacetonate(Y(acac)_(3))and melamine(C_(3)H_(6)N_(6)).The effects of compound additives on the microstructure,density,and thermal properties of Al N ceramic were studied.Y(acac)3and C_(3)H_(6)N_(6)can form Y_(2)O_(3),residual organic carbon and reducing gas during the heating process,which improves the Al N sintering performance at a temperature of 1700℃and the bulk thermal conductivity.When the content of Y(acac)_(3)is 10 wt%and C_(3)H_(6)N_(6)is 3 wt%,the thermal conductivity of Al N ceramics is 105.6 W/(m·K),which is much higher than that of Al N ceramics with Y_(2)O_(3)under the same sintering conditions.This work provides theoretical reference for the preparation of high-performance Al N ceramic.展开更多
Aluminum nitride ceramic sheets were formed for the first time by a novel and simple method,namely gel-tape-casting process,where only two additives were used to prepare the slurries.PIBM (a water-soluble copolymer of...Aluminum nitride ceramic sheets were formed for the first time by a novel and simple method,namely gel-tape-casting process,where only two additives were used to prepare the slurries.PIBM (a water-soluble copolymer of isobutylene and maleic anhydride) acted as both dispersant and gelling agent,and PEG (polyethylene glycol) acted as plasticizer.Combining the advantages of gel-casting and tape-casting processes,flexible and uniform green tapes were obtained.The rheological properties of AlN slurries were studied to optimize the PIBM content and solids loading.After drying and debinding,the green sheets were sintered at 1840 ℃ in N2 atmosphere.Homogeneous microstructure with average grain size of about 7 μm was observed in the final AlN ceramics.Thermal conductivity of the AlN ceramics was 161 W/(m·K).展开更多
基金National Natural Science Foundation of China(Nos.51872217,51972246)the Guangdong Major Project of Basic and Applied Basic Research(Nos.2021B0301030001)。
文摘AlN ceramics were prepared by plasma activation sintering(PAS)with compound additives yttrium acetylacetonate(Y(acac)_(3))and melamine(C_(3)H_(6)N_(6)).The effects of compound additives on the microstructure,density,and thermal properties of Al N ceramic were studied.Y(acac)3and C_(3)H_(6)N_(6)can form Y_(2)O_(3),residual organic carbon and reducing gas during the heating process,which improves the Al N sintering performance at a temperature of 1700℃and the bulk thermal conductivity.When the content of Y(acac)_(3)is 10 wt%and C_(3)H_(6)N_(6)is 3 wt%,the thermal conductivity of Al N ceramics is 105.6 W/(m·K),which is much higher than that of Al N ceramics with Y_(2)O_(3)under the same sintering conditions.This work provides theoretical reference for the preparation of high-performance Al N ceramic.
文摘Aluminum nitride ceramic sheets were formed for the first time by a novel and simple method,namely gel-tape-casting process,where only two additives were used to prepare the slurries.PIBM (a water-soluble copolymer of isobutylene and maleic anhydride) acted as both dispersant and gelling agent,and PEG (polyethylene glycol) acted as plasticizer.Combining the advantages of gel-casting and tape-casting processes,flexible and uniform green tapes were obtained.The rheological properties of AlN slurries were studied to optimize the PIBM content and solids loading.After drying and debinding,the green sheets were sintered at 1840 ℃ in N2 atmosphere.Homogeneous microstructure with average grain size of about 7 μm was observed in the final AlN ceramics.Thermal conductivity of the AlN ceramics was 161 W/(m·K).
