Al2O3 Mo金属陶瓷测温套管凝胶注模成型工艺

 采用凝胶注模成型工艺制备Al2O3 Mo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539%时，干坯强度相对较高。分散剂加入量在065%~090%时，浆料粘度为35~36 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Al2O3 Mo金属陶瓷烧结后体积密度为425 g/cm3，而模压成型、同等条件制备的Al2O3 Mo金属陶瓷体积密度仅为372 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Al2O3 Mo金属陶瓷测温套管可成功应用于高温合金测温。

Gel-Casting Process of Al2O3-Mo Cermet Protecting Tube

Preparation of Al2O3 Mo cermets by gel casting process was studied. The dry parts with 539% (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 065%~090%, the slurry has low viscosity of 35~36 Pa·s, which is appropriate for gel casting. Bulk density and line scanning analysis were carried out and the results show that the Al2O3 Mo cermets with density of 425 g/cm3 can be prepared, while the density of cermets by compression molding is only 372 g/cm3. The line scanning analysis reveals that the components are distributed homogeneously and there is hardly aliquation. The Al2O3 Mo protecting tube prepared can be successfully used for temperature measurement of superalloy.