采用凝胶注模成型工艺制备Al2O3Mo金属陶瓷。预混液中单体丙烯酰胺AM和交联剂N，N′亚甲基双丙烯酰胺MBAM质量比为35∶1，总量为干坯质量的539%时，干坯强度相对较高。分散剂加入量在065%~090%时，浆料粘度为35~36 Pa·s，适于凝胶注模。对烧结金属陶瓷试样作体积密度测定及线扫描分析，结果表明，凝胶注模成型Al2O3Mo金属陶瓷烧结后体积密度为425 g/cm3，而模压成型、同等条件制备的Al2O3Mo金属陶瓷体积密度仅为372 g/cm3。烧结试样断口各成分分布比较均匀，没有出现明显的偏析现象。制备出的Al2O3Mo金属陶瓷测温套管可成功应用于高温合金测温。
Preparation of Al2O3Mo cermets by gelcasting process was studied. The dry parts with 539% (based on the weight of the dry part) weight of AM and MBAM (AM∶MBAM=35∶1) have higher intensity. When dispersant content lies between 065%~090%, the slurry has low viscosity of 35~36 Pa·s, which is appropriate for gelcasting. Bulk density and linescanning analysis were carried out and the results show that the Al2O3Mo cermets with density of 425 g/cm3 can be prepared, while the density of cermets by compression molding is only 372 g/cm3. The linescanning analysis reveals that the components are distributed homogeneously and there is hardly aliquation. The Al2O3Mo protecting tube prepared can be successfully used for temperature measurement of superalloy.
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