Green bodies of Al_2O_3 and ZrO_2 ceramics were joined without applying pressure by using metal slurries of Al as an interlayer according to the mechanism of volume expansion in the oxidation process of Al+O_2→Al_2O_...Green bodies of Al_2O_3 and ZrO_2 ceramics were joined without applying pressure by using metal slurries of Al as an interlayer according to the mechanism of volume expansion in the oxidation process of Al+O_2→Al_2O_3. The microstructure of the joints was investigated. The results shows that interface cracks are easily produced. With addition of Al_2O_3 and ZrO_2 into the interlayer composition, fine joints could be obtained without obvious cracks, pores and other defects. Under the experimental conditions, the grain size of the particles grown in the joint is smaller than that in the parent material. Therefore, the addition of Al_2O_3 or ZrO_2 can buffer the defect resulting from the volume expansion in the oxidation process. And in the existence of Al_2O_3 or ZrO_2 in the interlayer, active Al_2O_3 can boost the interface reaction.展开更多
Effects of interlayer composition on bonding strength and interfacial microstructure of green joined Al_2O_3-ZrO_2 ceramics were studied in this paper. Green bodies of Al_2O_3 and ZrO_2 ceramics were joined by using i...Effects of interlayer composition on bonding strength and interfacial microstructure of green joined Al_2O_3-ZrO_2 ceramics were studied in this paper. Green bodies of Al_2O_3 and ZrO_2 ceramics were joined by using interlayer composed of Al_2O_3-Al-SiO_2 system at 1550 ℃ for 2 h without applied pressure. The effect of Al on the bond strength and microstructure of the joints were investigated. Through comparing five approaches or conditions, the results indicate that when adding 22% Al, the joints are the best in terms of bend strength and the microstructures of the joints are homogeneous and without obvious cracks, pores and defects.展开更多
文摘Green bodies of Al_2O_3 and ZrO_2 ceramics were joined without applying pressure by using metal slurries of Al as an interlayer according to the mechanism of volume expansion in the oxidation process of Al+O_2→Al_2O_3. The microstructure of the joints was investigated. The results shows that interface cracks are easily produced. With addition of Al_2O_3 and ZrO_2 into the interlayer composition, fine joints could be obtained without obvious cracks, pores and other defects. Under the experimental conditions, the grain size of the particles grown in the joint is smaller than that in the parent material. Therefore, the addition of Al_2O_3 or ZrO_2 can buffer the defect resulting from the volume expansion in the oxidation process. And in the existence of Al_2O_3 or ZrO_2 in the interlayer, active Al_2O_3 can boost the interface reaction.
文摘Effects of interlayer composition on bonding strength and interfacial microstructure of green joined Al_2O_3-ZrO_2 ceramics were studied in this paper. Green bodies of Al_2O_3 and ZrO_2 ceramics were joined by using interlayer composed of Al_2O_3-Al-SiO_2 system at 1550 ℃ for 2 h without applied pressure. The effect of Al on the bond strength and microstructure of the joints were investigated. Through comparing five approaches or conditions, the results indicate that when adding 22% Al, the joints are the best in terms of bend strength and the microstructures of the joints are homogeneous and without obvious cracks, pores and defects.
