基于聚乙烯醇胶凝特性的陶瓷零件快速制造技术

提出了一种新的陶瓷零件快速制造技术。该技术主要利用聚乙烯醇溶液在Na2B4O7·10H2O水溶液引发下迅速发生反应完成从液态向固态转变的特性,采用快速原型制造技术的原理逐层叠加,再经过有机物排除、素烧和烧结得到陶瓷零件。以制备金红石瓷为例,给出了陶瓷浆料的制备及陶瓷生坯的制造过程。用差示扫描量热法(DSC)研究了有机物排除,用X射线衍射(XRD)及扫描电镜(SEM)分别测试了金红石瓷的物相组成及显微结构。结果表明:经高温烧结后材料中无残余硼存在,无分层现象且层间结合紧密,抗弯强度达到45.6 MPa。

Rapid Manufacturing Technology for Ceramic Parts Based of Gelation of Polyvinyl Alcohol

A new rapid manufacturing technology for ceramic parts was proposed. The feature of this technology came from its layer-by-layer fabrication of the gelled PVA-ceramic suspensions induced by sodiumtetraborate while the single layer was fabricated by gelation of the suspensions after cutting and in situ filling with PVA water solution. Rutile ceramic was successfully prepared by this technology. Preparation of titanium dioxide slurry was performed and the manufacturing process of the green ceramic body was given. The organic pyrolysis in the low temperature phase of PVA was investigated by differential scanning calorimetry (DSC) analysis. No delamination was exhibited by scanning electron microscopy (SEM) and no residual boron phase was identified by X-ray diffraction (XRD) analysis. A mean bending strength of 45. 6 MPa was determined by a tri-point bending test