摘要
传统的水玻璃砂型回收利用率低,会对土壤环境造成严重碱性污染,为了消除污染源、减轻环保压力,采用选择性激光烧结成型技术快速制备一种低导热高强度石墨陶瓷复合型以替代水玻璃砂型。研究了热固性酚醛树脂粉末加入量对石墨陶瓷复合型素坯成型工艺性的影响,通过加入高纯硅粉和可膨胀石墨粉末对石墨陶瓷复合型的导热性能和抗压强度进行调控。结果表明:适当的酚醛树脂加入量有助于保证复合型素坯的成形精度和抗弯强度,石墨陶瓷复合型的抗压强度和导热系数随着硅粉加入量的增加而增大,而随着可膨胀石墨粉末的加入量的增加而减小。当酚醛树脂粉末、高纯硅粉和可膨胀石墨粉末加入量分别为30 mass%、25 mass%和1 mass%时,复合型具有较低的导热系数(1.89 W·m^(-1)·K^(-1))和较高的抗压强度(10.54 MPa),铸钢件浇铸实验表明新型石墨陶瓷复合型能够多次重复使用、安全环保、使用成本远低于传统的水玻璃砂型。
The traditional water glass sand mold has low recovery efficiency, which will cause serious alkaline pollution to the soil environment. In order to eliminate the pollution source and reduce the pressure of environmental protection, a kind of graphite ceramic composite mold with low thermal conductivity and high strength was prepared by selective laser sintering to replace water glass sand mold. The influence of the amount of thermosetting phenolic resin powder on the molding process of graphite ceramic composite blanks was studied. The thermal conductivity and compressive strength of the graphite ceramic composite were regulated by adding high purity silicon powder and expandable graphite powder. The results show that the proper amount of phenolic resin is helpful to ensure the forming accuracy and bending strength of the composite blank. The compressive strength and thermal conductivity of the graphite ceramic composite mold increase with the increase of silicon powder addition and decrease with the increase of expandable graphite powder addition. When the addition amount of phenolic resin powder, high purity silica powder and expandable graphite powder are 30 mass%, 25 mass% and 1 mass%, respectively, the composite mold has lower thermal conductivity(1.89 W·m^(-1)·K^(-1)) and higher compressive strength(10.54 MPa). The casting experiment of steel castings shows that the new graphite ceramic composite mold can be reused many times, safe and environmentally friendly, and the cost is much lower than that of the traditional water glass sand mold.
作者
吴海华
李亚峰
贺俊超
刘文斌
张成
WU Hai-hua;LI Ya-feng;HE Jun-chao;LIU Wen-bin;ZHANG Cheng(Yichang Key Laboratory of Graphite Additive Manufacturing,School of Mechanical and Power Engineering,China Three Gorges University,Yichang 443002,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第2期11-19,共9页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51575313)
湖北省技术创新专项重大项目(2019AAA164)。
关键词
石墨陶瓷复合型
选择性激光烧结成形
低导热高抗压
材料配方
性能调控
graphite ceramic composite mold
selective laser sintering forming
low thermal conductivity and high compression resistance
material formulation
performance control
