Materials Processing and Engineering for Superplastic Ceramics

这项研究将研究超塑变形氮化硅基和莫来石陶瓷材料的工艺和性能，建立描述多晶陶瓷蠕变应变-变形行为的本构关系，并开发简单部件的超塑成形工艺，包括陶瓷片的气体吹塑成形和超塑性陶瓷的扩散连接。超塑性成形指的是在高温和不发生断裂的条件下，将部件缓慢变形成所需形状。虽然超塑性成形在金属材料，特别是钛合金中的应用已经取得了一定的成功，但将该工艺应用于陶瓷的成形是非常新颖的。陶瓷材料极难形成和精加工，通常需要进行磨削操作，这可能会损坏表面并导致故障。因此，将固体陶瓷变形成形状零件的能力将是一个重大进步。

The research will investigate the processing and properties of superplastically deformed silicon nitride-based and mullite ceramic materials to develop constitutive relationships describing the creep strain-deformation behavior of polycrystalline ceramics and to develop processes for the superplastic forming of simple components, including the gas blow-forming of ceramic sheets and the diffusion bonding of superplastic ceramics. Superplastic forming involves the slow deformation of the component into the desired shape at high temperatures and under conditions under which fracture does not occur. While superplastic forming has been applied with some success to metallic materials, titanium alloys in particular, the application of the process to the forming of ceramics is highly novel. Ceramic materials are extremely difficult to form and finish, normally requiring grinding operations which may damage the surface and cause failure. Therefore, the ability to deform solid ceramics into shaped parts would be a major advance.