Materials Processing and Engineering for Superplastic Ceramics

本研究将探讨其加工及性质 超塑性变形氮化硅基和莫来石 陶瓷材料开发本构关系描述 多晶陶瓷蠕变变形行为 并开发简单的超塑性成形工艺， 组件，包括陶瓷板的气体吹制成型， 超塑性陶瓷的扩散连接 超塑性成形涉及材料的缓慢变形， 在高温和低温下， 不发生断裂的条件。 虽然超塑性 成形已经成功地应用于金属材料， 特别是钛合金， 陶瓷的形成是非常新颖的。 陶瓷材料 极难成型和精加工，通常需要研磨 可能损坏表面并导致故障的操作。 因此，将固体陶瓷变形为成形零件的能力 将是一个重大的进步

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.