摘要
建立了硬质合金烧结-热等静压炉内传热的三维非稳态数值仿真模型,对炉内的温度场进行仿真与优化。提出分段仿真方法,即在真空加热阶段采用层流模型和S2S辐射模型,在低压和高压氩气加热阶段采用k-ε湍流模型和DTRM辐射模型。结果表明:仿真结果与实验结果相吻合;石墨筒内温度分布不均匀,其主要原因是石墨舟和烧结制品布置方式以及石墨筒结构的不合理。实验中提出优化措施,使烧结制品表面温度偏差在真空阶段减小约10 K,在气体加热阶段减小到±7 K以内,从而可提高烧结质量。
A three dimensional unsteady numerical model of cemented carbide sinter-HIP furnace was established. The temperature field was simulated and optimized with this model. Dividual simulation method was put forward in the model. In this method laminar flow model and S2S radiation model were used in vacuum heating stage, and κ-ε turbulence model and DTRM model were adopted in low-pressure and high-pressure argon heating stages, The simulation results are in consistence with the experiment results, and shows that the temperature distribution in the graphite box is non-uniform, which is mainly caused by the illogical location of the graphite boards and the sintered products and the unreasonable structure of the graphite box. Therefore, the measures to optimize the temperature were brought forward, and the temperature difference reduction of the sintered product surface is reduced to 10 K during the vacuum heating stage, and the temperature difference of sintered product surface falls to ±7 K during the gas heating stage, which can enhance the sintering quality.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第2期320-325,共6页
Journal of Central South University:Science and Technology
关键词
硬质合金
烧结-热等静压炉
温度场
数值仿真
优化
cemented carbide
sinter-HIP furnace
temperature field
numerical simulation
optimization
