Abstract The microstructure and the mechanical properties of ZrB 2 –SiC–Cf ceramic composites were investigated. The SiC phase, whose amount was varied from 5 to 20 vol%, was introduced in order to improve the densification, oxidation resistance and mechanical properties of the composite. The microstructure was analysed by SEM-EDS and image analysis. Increasing the amount of SiC from 5 to 20 vol% resulted in an improvement of the materials density, from 90% to 94%. The non-brittle 4-pt flexural strength ranged from 164 to 247 MPa, with no clear dependence on the amount of SiC added. The same holds true for the fracture toughness, ranging from 4.8 to 8.4 MPa·m 0.5 . In order to track the most important microstructural parameters affecting the properties, experimental data were analysed with the Random Forest and Regression Tree statistical models. The statistical analysis demonstrated that among the possible explanatory variables such as porosity, amount of SiC, fibre content, matrix content, SiC/fibre amount ratio, the one having a major influence on both the flexural strength and fracture toughness is the ratio between SiC and carbon fibre content.

中文翻译：

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通过随机森林和回归树分析了解新型 UHTCMC 的力学性能

摘要 研究了ZrB 2 -SiC-Cf陶瓷复合材料的微观结构和力学性能。为了提高复合材料的致密化、抗氧化性和机械性能，引入了 SiC 相，其含量从 5% 到 20% vol% 不等。通过SEM-EDS和图像分析来分析微观结构。将 SiC 的量从 5 vol% 增加到 20 vol% 导致材料密度提高，从 90% 到 94%。非脆性 4-pt 弯曲强度范围为 164 至 247 MPa，与添加的 SiC 量没有明显关系。断裂韧性也是如此，范围从4.8 到8.4 MPa·m 0.5 。为了跟踪影响性能的最重要的微观结构参数，使用随机森林和回归树统计模型分析了实验数据。