High-temperature flexural strength refers to the ultimate bending stress that zirconia ceramic materials can withstand per unit cross-section at high temperatures. It characterizes the ability of zirconia ceramic materials to resist bending moments at high temperatures. What factors affect the high-temperature flexural strength of zirconia ceramics?
1. Grain size: Generally, ceramics with smaller grain sizes have higher flexural strength. Smaller grain sizes can improve the grain boundary-strengthening effect of materials and increase the ability to resist crack propagation.
2. Grain boundaries: Grain boundaries are the interface areas between grains in zirconia ceramics. The structure and properties of grain boundaries play an important role in high-temperature flexural strength. Good grain boundary structure and chemical stability can prevent crack propagation and improve the flexural strength of materials.
3. Impurity content: High-purity zirconia ceramics usually have higher flexural strength because the presence of impurities may lead to the weakening of grain boundaries or uneven growth of grains.
4. Crystal phase: Zirconia ceramics have different crystal phases, the most common of which are monoclinic and cubic phases. Different crystal phases have different mechanical properties. Generally speaking, cubic zirconia has higher high-temperature flexural strength.
5. Sintering process: Appropriate sintering temperature, time, pressure and other parameters can promote grain growth and densification, thereby improving flexural strength.
In summary, the high-temperature flexural strength of zirconia ceramics is affected by a variety of factors such as grain size, grain boundary, impurity content, crystal phase, and sintering process. In the design, preparation, and application of materials, it is necessary to fully consider the relationship between these factors, and improve the high-temperature mechanical properties of zirconia ceramics by optimizing various factors to meet the high requirements of material performance in different fields.
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