ムライト・ジルコニア複合セラミックスの高温特性

概要

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Ceramics has many remarkable properties compared with other materials, for example, high strength at high temperatures, very low thermal conductivity, tribological low wear rate and so on. However, if ceramics used as a heat insulating material in an internal combustion engine occurs thermal stress problem with its lower ductility. These point of of view, the characteristics of mullite/3mol%Y_2O_3 zirconia composite ceramics such as bending strength, thermal stability, corrosion resistance and so on were examined at high temperatures. From the test results of mullite zirconia composite ceramics, the followings are summarized : 1) Test results of three-point bending strength shows that the 15% PSZ mass% has higher strength level than 100% mullite at temperatures below 750℃. 2) Thermal stability test results shows not any remarkable tedency compered with the test results at room temperatures. 3) Hot corrosion test results of 10-15% PSZ mass% with V_2O_6 shows slight mass reduction at temperature of 750℃. 4) Creep test results of 15% PSZ mass% shows not any remarkable tedency in elongation and XRD patterns at temperature of 750℃. As these results, mullite zirconia composite ceramics can be used as a heat insulating material in an internal combustion engine below 750℃, except that the possibility of corrosion occurs by using lower grade fueles.
独立行政法人海上技術安全研究所の論文
1998-01-14