Zirconia ceramics can theoretically withstand high temperatures of up to 1350 degrees, so is its heat resistance in use really that strong? The following Pintejin Ceramics Factory will give you an analysis.
The thermal stress in the zirconia ceramic material depends on the mechanical and thermal properties of the material, and is affected by the geometry of the structural parts and the environmental medium. The thermal shock resistance, which is the ability of ceramic materials to resist temperature changes, is a comprehensive performance of the mechanical properties and thermal properties of ceramic materials.
The thermal vibration damage of zirconia ceramic materials is divided into two categories: instantaneous fracture under thermal shock and cracking, spalling under thermal shock cycle, and thermal layer damage due to overall damage.
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One is based on the theory of thermoelasticity, which refers to the thermal shock fracture of the material when the inherent strength of the material is insufficient to resist the thermal stress caused by the thermal shock temperature difference. According to this theory, if the ceramic material has high strength, thermal conductivity and low thermal expansion coefficient, Young’s modulus of elasticity, Poisson’s ratio, thermal radiation coefficient and viscosity at the same time, it has high thermal shock resistance ability. In addition, appropriately reducing the density and heat capacity of the material is also beneficial to improve the thermal shock resistance of the ceramic material.
The other is based on the concept of fracture mechanics. When the thermoelastic strain energy in the material is sufficient to cover the energy required for crack nucleation and propagation to create a new surface, cracks form and propagate, resulting in thermal shock damage to the material. According to this theory, a material with good thermal shock damage resistance should have the highest possible elastic modulus and the lowest possible strength.
The zirconia ceramic rods and zirconia ceramic structural parts produced by Dongguan Pintejin Ceramics Factory have outstanding mechanical properties at room temperature. It has a high melting point and good thermal and chemical stability, so it can often be used at high temperatures. Thermal shock resistance of injection molding is one of its important indicators.
Zirconia has monoclinic, tetragonal and cubic crystal forms at the same time, and has special phase transition characteristics, which can be used to optimize its thermal expansion behavior and improve thermal shock resistance.