SHS-离心法陶瓷衬管致密性的提高

Study on increasing density of SHS-centrifugal method metal/ceramic composite pipes

采用自蔓延高温合成技术 (SHS法 )与离心技术相结合 ,在普通碳素钢管的内壁复合上一层均匀的陶瓷层 ,制成金属 -陶瓷复合管。利用X射线衍射和扫描电镜进行陶瓷层的组织结构、相组成和成分分析 ,并测定了陶瓷层的密度、硬度和耐磨性能。结果表明 ,适量添加SiO2 ,在陶瓷的凝固和致密化过程中 ,降低了反应凝固终了温度 ,延长了陶瓷的熔融时间 ,提高了陶瓷层液相的流动性 ,加速了气体排除 ,陶瓷层的致密性得到提高。

Combining the self propagating high temperature synthesis technology (SHS method) and the centrifugal technique,a uniform ceramic layers and metal/ceramic composite pipes can be formed.The structure,phase component and distribution of ceramic layers were studied by X ray diffraction and scanning electronic microscopy.The density,hardness and wear resistance of composite pipes were also tested.The results show that during solidification and densifying of ceramic with the addition of SiO 2,finishing temperature of solidification of the SHS reaction was decreased.Thus it allowed more time for the release of the gases and improved the fluidizing of the ceramic liquid.Therefore,the density of ceramic layers was improved.