Extrusion behavior of metal–ceramic composite pipes in multi-billet extrusion process
Extrusion behavior of metal–ceramic composite pipes in multi-billet extrusion process
复制标题
多坯料挤压过程中金属陶瓷复合管材的挤压行为
DOI：
10.1016/s0924-0136(01)00726-9
复制
发表时间：
2001
影响因子：
6.3
通讯作者：
T. Takeda
中科院分区：
文献类型：
--
作者：
Zhongchun Chen;K. Ikeda;T. Murakami;T. Takeda
采用多坯挤压（MBE）技术制备了氧化锆/不锈钢双层复合管材。分子束外延工艺的特征在于共挤出含有水基粘合剂的不同种类的颗粒浆料，将它们在腔室中接合，并最终通过模具获得所需的挤出物。结果表明，无论内层和外层的氧化锆和不锈钢粉末的混合比例如何，都可以获得良好的挤出物。与常规棒挤出相比，MBE需要更大量的粘合剂。此外，由于挤出模具的特征结构，在双层管的挤出过程中，外层比内层需要更好的流动性。通过使用具有较宽粒度分布的混合粉末和具有较长刃带的模头，可以使粘合剂的量最小化。添加少量甘油或使用部分稳定的氧化锆粉末可有效抑制挤出物在干燥过程中裂纹的形成。
Two-layer composite pipes consisting of zirconia and stainless steel were fabricated by a multi-billet extrusion (MBE) technique. The MBE process is characterized by coextruding different kinds of particulate pastes containing a water-based binder, joining them in chambers and finally obtaining a desired extrudate by means of dies. It is shown that sound extrudates can be obtained no matter what mixing ratios of zirconia and stainless steel powders in both inner and outer layers are used. The MBE requires a larger amount of binder compared to conventional rod extrusion. Furthermore, a better flowability is necessary for the outer layer than for the inner one in the extrusion process of a two-layer pipe, as a result of the characteristic structures of the extrusion dies. The amount of binder can be minimized by using mixed powder with a wider particle size distribution and a die with a longer land. It is effective to add a small amount of glycerol or use partially stabilized zirconia powder in restraining the crack formation in extrudates during drying period.