摘要
采用超高摩尔质量聚乙烯(UHMWPE)粉体为原料,通过模压成型,分别在炉、空气、水、液氮中冷却来改变其冷却速度。对不同冷速下的UHMWPE样品进行硬度、拉伸、接触角、摩擦磨损测试。利用SEM观察试样磨损形貌,DSC测试样品结晶度。结果表明:随着冷却速度的增大,试样的结晶度降低;随着结晶度的增加,试样的硬度、屈服强度、拉伸强度和抗蠕变性能提高,但是试样的延伸率下降,同时试样表面润湿性降低。在25%小牛血清润滑条件下,随着结晶度的增加,UHMWPE的摩擦因数和磨损量降低,耐磨性提高。
In this paper, UHMWPE powder was used as raw materials to prepare UHMWPE samples by thermal compression molding method, and then they were cool separately in furnace, air, water and liquid nitrogen. For the samples acquired under different cooling rate, the hardness test, tensile test, contact angle test, friction and wear test of UHMWPE specimen were evaluated. The wear morphology and crystallinity of the samples was evaluated using SEM and DSC. The results showed that crystallinity of the samples decreased with the increase of the cooling rate. With the increase of crystallinity degree, the hardness, the yield strength, tensile strength and creep resistance of UHMWPE sample were improved, but the elongation and the wet property of UHMWPE samples decreased. In the lubricant condition of 25% bovine serum, the friction coefficient and wear loss decreased with the increase of the degree of crystallinity, which represented better wear resistance.
出处
《塑料工业》
CAS
CSCD
北大核心
2013年第6期87-91,共5页
China Plastics Industry
基金
2011年江苏省大学生实践创新训练计划项目
