摘要
粉末材料激光烧结的温度场对工艺参数优化和烧结成形物质量有着直接影响。从瞬时点热源三维传热出发,建立了高斯面热源激光扫描烧结过程的非稳态导热温度场的三维解析模型,利用理论和实验相结合,计算了随温度变化的尼龙粉末的有效导热系数,给出了热扩散率与激光烧结能量的关联表达式,通过温度场的模拟和实验结果的比较,验证了模型求解及参数拟合的有效性。
The temperature fields of powder laser sintering have a direct influence on optimization of process parameters and sintering quality. From three-dimensional heat transfer of point source, three-dimensional analytical model of non-steady-state temperature field for scanning laser sintering was established. With the moving Gauss area heat source, effective thermal conductivity of nylon powder with temperature changed was calculated. The expression of thermal diffusivity and laser energy was obtained. Finally, by simulation and theory of temperature field, validity of the model and parameter fitting was verified.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第1期81-87,共7页
Chinese Journal of Lasers
基金
国家863计划(2006AA04Z311)资助课题
关键词
激光技术
快速原型
激光烧结
温度场
有效导热系数
热扩散率
laser technique
rapid prototyping
selective laser sintering
temperature field
effective thermalconductivity~ thermal diffusivity
