摘要
采用全因素正交实验和响应曲面实验相结合的方法确定等静压石墨材料成型工艺。结果表明,全因素正交实验确定成型压力、保压时间、泄压速率以及成型压力和保压时间、保压时间和泄压时间的交互作用对等静压石墨抗折强度影响显著,其数学模型拟合良好,但是模型弯曲项显著,表明在高低水平间存在极值,正交实验难以确定最佳工艺条件。利用响应曲面实验可以对等静压成型工艺很好拟合,通过预测和实验验证确定等静压成型工艺的最佳条件:成型压力215MPa、保压时间18.4min、泄压速率1MPa/s,在此条件下成型并进行焙烧石墨化,所制得的等静压石墨材料具有24.40MPa的抗折强度,其结果与模型预测一致,证明响应曲面优化结果可靠。
In order to find out the best forming process of isostatic pressing graphite material,all factor orthogonal experiment and re-sponse surface experiment were adopted.The results show that the forming pressure,holding time,pressure release rate,the interaction between forming pressure and holding time,holding time and pressure release time have significant impacts on bending strength of iso-static pressing graphite,the mathematical model is well ftted,but the model bending term is significant,indicating that there is an ex-treme value between the high and low levels,and it is difficult to determine the optimal process conditions by orthogonal experiment.While the response surface experiment can be used to fit the isostatic forming process well,the optimal conditions of isostatic forming process determined by the prediction and experimental verification are:molding pressure of 215 MPa,pressure holding time of 18.4 min,pressure relief rate of 1 MPa/s.Under these conditions,the isostatic pressing graphite material has a bending strength of 24.40 MPa,and the results are consistent with the model prediction,which proves that the response surface optimization results are reliable.
作者
李涛
汪伟
申保金
谢霭祥
Li Tao;Wang Wei;Shen Bao-jin;Xie Ai-xiang(Sinosteel Nanjing Advanced Mat erials Research Institute Co.,Ltd.,Jiangsu Nanjing 21000,China;Sinostee New Materials Co.,Ltd.,Anhui Maanshan 243000,China)
出处
《炭素技术》
CAS
北大核心
2024年第3期52-56,共5页
Carbon Techniques
关键词
等静压石墨
成型工艺
抗折强度
正交实验
响应曲面法
Isostatic pressing graphite
forming process
bending strength
orthogonal experiment
response surface method
