Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3JD, United Kingdom.
Mater Sci Eng C Mater Biol Appl. 2013 Oct;33(7):3858-64. doi: 10.1016/j.msec.2013.05.021. Epub 2013 May 18.
Porous titanium samples were manufactured using the 3D printing and sintering method in order to determine the effects of final sintering temperature on morphology and mechanical properties. Cylindrical samples were printed and split into groups according to a final sintering temperature (FST). Irregular geometry samples were also printed and split into groups according to their FST. The cylindrical samples were used to determine part shrinkage, in compressive tests to provide stress-strain data, in microCT scans to provide internal morphology data and for optical microscopy to determine surface morphology. All of the samples were used in microhardness testing to establish the hardness. Below 1100 °C FST, shrinkage was in the region of 20% but increased to approximately 30% by a FST of 1300 °C. Porosity varied from a maximum of approximately 65% at the surface to the region of 30% internally. Between 97 and 99% of the internal porosity is interconnected. Average pore size varied between 24 μm at the surface and 19 μm internally. Sample hardness increased to in excess of 300 HV0.05 with increasing FST while samples with an FST of below 1250 °C produced an elastic-brittle stress/strain curve and samples above this displayed elastic-plastic behaviour. Yield strength increased significantly through the range of sintering temperatures while the Young's modulus remained fairly consistent.
采用 3D 打印和烧结方法制造多孔钛样品，以确定最终烧结温度对形态和机械性能的影响。将圆柱形样品打印并根据最终烧结温度（FST）分成几组。不规则几何形状的样品也根据其 FST 进行分组。圆柱形样品用于确定零件收缩率，在压缩试验中提供应力-应变数据，在微 CT 扫描中提供内部形态数据，并通过光学显微镜确定表面形态。所有样品均用于微硬度测试以确定硬度。在 FST 低于 1100°C 的情况下，收缩率在 20%左右，但通过 FST 为 1300°C 增加到约 30%。孔隙率从表面的最大约 65%变化到内部的 30%区域。内部孔隙率的 97%至 99%是相互连通的。平均孔径在表面处为 24μm，在内部处为 19μm。随着 FST 的增加，样品硬度增加到超过 300HV0.05，而 FST 低于 1250°C 的样品产生弹性脆性应力/应变曲线，高于该温度的样品则表现出弹塑性行为。屈服强度在整个烧结温度范围内显著增加，而杨氏模量则保持相当一致。
