The experiments and theoretical analysis on the thermal conductivity of AlN ceramic substrate are carried out.All the results prove the following viewpoints:the maximum thermal conductivity of AlN with a lower oxygen ...The experiments and theoretical analysis on the thermal conductivity of AlN ceramic substrate are carried out.All the results prove the following viewpoints:the maximum thermal conductivity of AlN with a lower oxygen concentration is higher and the thermal conductivity decreases with the increase of oxygen concentration in AlN ceramic;Y 2O 3 acting as a sintering additive should be mixed more into the AlN powder with a lower oxygen concentration.Secondary phases affect the thermal conductivity of AlN significantly.The quantitative relationship between the thermal conductivity and oxygen,Y 2O 3 is developed.展开更多
Abstract： An alloy steel/alumina composite was successfully fabricated by pressureless infiltration of X10CrNil8-8 steel melt on 30% （mass fraction） Ni-containing alumina based composite ceramic （Ni/Al2O3） at 1 6...Abstract： An alloy steel/alumina composite was successfully fabricated by pressureless infiltration of X10CrNil8-8 steel melt on 30% （mass fraction） Ni-containing alumina based composite ceramic （Ni/Al2O3） at 1 600 ℃. The infiltration quality and interfacial bonding behavior were investigated by SEM, EDS, XRD and tensile tests. The results show that there is an obvious interfacial reaction layer between the alloying steel and the Ni/Al2O3 composite ceramic. The interfacial reactive products are （FexAly）3O4 intermetallic phase and （AlxCry）2O3 solid solution. The interracial bonding strength is as high as about 67.5 MPa. The bonding mechanism of X10CrNi 18-8 steel with the composite ceramic is that Ni inside the ceramic bodies dissolves into the alloy melt and transforms into liquid channels, consequently inducing the steel melt infiltrating and filling in the pores and the liquid channels. Moreover, the metallurgical bonding and interfacial reactive bonding also play a key role on the stability of the bonding interface.展开更多
文摘The experiments and theoretical analysis on the thermal conductivity of AlN ceramic substrate are carried out.All the results prove the following viewpoints:the maximum thermal conductivity of AlN with a lower oxygen concentration is higher and the thermal conductivity decreases with the increase of oxygen concentration in AlN ceramic;Y 2O 3 acting as a sintering additive should be mixed more into the AlN powder with a lower oxygen concentration.Secondary phases affect the thermal conductivity of AlN significantly.The quantitative relationship between the thermal conductivity and oxygen,Y 2O 3 is developed.
基金Project(2009ZM0296) supported by the Fundamental Research Funds for the Central Universities in China
文摘Abstract： An alloy steel/alumina composite was successfully fabricated by pressureless infiltration of X10CrNil8-8 steel melt on 30% （mass fraction） Ni-containing alumina based composite ceramic （Ni/Al2O3） at 1 600 ℃. The infiltration quality and interfacial bonding behavior were investigated by SEM, EDS, XRD and tensile tests. The results show that there is an obvious interfacial reaction layer between the alloying steel and the Ni/Al2O3 composite ceramic. The interfacial reactive products are （FexAly）3O4 intermetallic phase and （AlxCry）2O3 solid solution. The interracial bonding strength is as high as about 67.5 MPa. The bonding mechanism of X10CrNi 18-8 steel with the composite ceramic is that Ni inside the ceramic bodies dissolves into the alloy melt and transforms into liquid channels, consequently inducing the steel melt infiltrating and filling in the pores and the liquid channels. Moreover, the metallurgical bonding and interfacial reactive bonding also play a key role on the stability of the bonding interface.
