A zirconia composite alumina ceramic sintered body and its preparation method and application
A technology of compounding alumina and zirconia, applied in the field of alumina ceramics, can solve the problems of main crystal phase particle growth, uneven dispersion, uneven distribution of the second phase, etc., achieve good fracture toughness and bending strength, and promote sintering and densification. The effect of sintering and accelerating the sintering rate
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[0036] The specific preparation methods of Examples 1-19 and Comparative Examples 1-2 include the following steps: Weigh a certain mixed powder in proportion, add dispersant, adhesive, plasticizer, lubricant to carry out ball milling, defoaming, and then carry out The green body is obtained by tape casting, and the green body is sintered at a high temperature of 1500-1600 ° C. After the end, it is naturally cooled to room temperature with the furnace, and the alumina ceramic substrate is obtained after post-processing.
[0037] The fracture toughness and flexural strength of Examples 1-19 and Comparative Examples 1-2 were measured respectively, and the test results are shown in Table 2. Among them, the fracture toughness test method is as follows: the fracture toughness of the composite material is measured by the single edge notched beam method (SENB method) and the three-point bending test with the electronic universal testing machine, and the loading rate is set at 0.05 mm / m...
Embodiment 6
[0043] Embodiment 6 is the best effect of the foregoing embodiments. Cause Analysis: When 3Y-ZrO 2 When the content is low, the amount of tetragonal zirconia that has the effect of phase transformation toughening is small, and the energy absorbed by external force is limited, resulting in poor phase transformation toughening effect. When 3Y-ZrO 2 When the content is high, on the one hand, it is due to the ZrO 2 Uneven distribution in alumina causes uneven microstructure, which causes cracks inside ZTA ceramics; on the other hand, zirconia overlaps and distributes in alumina, with many grain boundaries, and the coefficient of thermal expansion between zirconia and alumina The imbalance leads to poor densification during sintering, which leads to its poor flexural strength.
[0044] It can be seen from Examples 11-19 and Comparative Example 2 that when the content of Ca-Mg-Si flux is changed, the flexural strength and fracture toughness of the alumina-based ceramic substrate ...
Embodiment 14
[0045]Embodiment 14 is the best effect of the foregoing embodiments. Reason analysis: Ca-Mg-Si flux forms a molten glass phase, and the generated glass phase is distributed along the contact interface of each particle, and the atoms fill the pores through liquid diffusion and transmission, and promote sintering densification. When the content of Ca-Mg-Si flux is low, the glass phase formed by melting is limited and cannot completely fill the pores, resulting in insufficient sintering. When the Ca-Mg-Si flux content is high, the excess flux glass phase acts as an "impurity" component and randomly distributes between the alumina grain boundaries, resulting in the inability of the adjacent alumina grains to be tightly bonded, thus causing the ceramic substrate to bend Reduced strength.
[0046] In Examples 5 to 7 and Examples 11 to 16, when the ceramic sintered body contains the following components in mass percentage: 6.65-10.45wt% of zirconium-containing compound (calculated i...
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