摘要
采用自制电阻式粉末温压系统研究了铁基粉末的温压行为,对铁基粉末在温压过程中的加热温度与粉末流动性关系、加热方式与粉末冶金制品密度关系及模具温度与压坯硬度关系进行了研究。实验结果表明:粉末在合适的温度及压制力即粉末温度在(85±5)℃温度范围,模具外壁温度在135℃(内壁温度为115℃),压制力为700~750 MPa时,所得到的粉末压坯密度最大,且此时测出其脱模力亦较小,粉末压坯硬度值较大;润滑剂在压制过程中能够有效降低颗粒间以及粉末与模具间摩擦力,使实际作用在粉末上的作用力增大,有效提高了制品致密化程度。
The warm compaction behavior of iron-based powder in different conditions with the resistance type powder warm compaction system was studied. The relationship between heating temperature and liquidity of Fe-based powders,heating methods and density of products,mold temperature and compact hardness during warm compaction process were analyzed. The results show that the Fe-based powders can maximize the density of powder compacts at appropriate temperature and pressure. The powders have lower ejection forces and larger hardness of compacts when the power temperature is in the range of( 85 ± 5) ℃,mold wall temperature is 135 ℃( inner wall temperature is 115 ℃),the compaction pressure is between 700 and 750 MPa,which is the best powder warm compaction process parameters,and that the powder lubricant in the compacting process can effectively reduce friction among powders as well as powders and molds,increase the actual effect of the force acting on the powder and effectively improve the degree of densification of the powder product.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第6期15-19,共5页
Transactions of Materials and Heat Treatment
基金
安徽省教育厅自然科学基金重点项目(KJ2013A227)
国家自然科学基金资助项目(51104051)
科技型中小企业技术创新基金资助项目(11C26213401903)
关键词
粉末冶金
温压行为
致密化
工艺参数
powder metallurgy
warm compaction behavior
densification
process
