程小苏
,
李佳
,
曾令可
,
王慧
,
税安泽
人工晶体学报
选择了三种成膜性较好的高分子物质羧甲基纤维素钠(CMC)、聚乙烯醇(PVA)和甲基硅酸钠对石膏模进行改性,并采用SEM测试方法对石膏晶体形貌进行表征分析.结果表明:这三种高分子添加剂都能显著降低石膏的溶蚀率和提高石膏试样强度.CMC由于羧基与钙离子结合可改变石膏晶体形貌,而PVA和甲基硅酸钠对石膏晶体形貌无影响,但分子中憎水基的存在使得石膏模瞬间吸水能力减弱.综合考虑,CMC、PVA和甲基硅酸钠的最佳添加量分别为石膏粉质量的0.03％、0.015％、0.075％.甲基硅酸钠相比而言更适合工业化生产作为石膏模改性添加剂.
关键词:
石膏模
,
CMC
,
PVA
,
甲基硅酸钠
L.C. Wang
,
F. Wang
金属学报(英文版)
This paper briefly presents characteristics, application and development of the metal-lic foams. Sound specimen has been achieved with preparing foam aluminum by usinginvestment casting process. The preparation of plaster prefabricated mould is one keyin investment casting. Main composition, ingredient and affecting factors of plas-ter mould are also discussed and the vacuum-infiltrated shaping technique was foundto be another important link. The penetrating model and the affecting mechanismof the main parameters were also analyzed. As a result, the optimum values weredetermined.``
关键词:
aluminum foam
,
null
,
null
