铝合金金属型用海泡石喷涂涂料悬浮率和强度的研究.pdfVIP

学兔兔 铸 造 Aug．2015 FOUNDRY Vo1．64 NO．8 铝合金金属型用海泡石喷涂涂料悬浮率和 强度的研究 杨剑雄，黄 晋，龙 威，张友寿，夏 露，王小路 (湖北工业大学绿色轻工材料湖北省重点实验室，湖北武汉430068) 摘要：用海泡石作主耐火骨料，高岭土、鳞片石墨粉和滑石粉作辅助耐火骨料，水玻璃作粘结剂，钠基膨润土和羧 甲基纤维素钠 (CMC)作悬浮剂，制作了一种用于铝合金金属型的水基海泡石喷涂涂料，并对各种材料加入量对涂 料悬浮率和强度的影响进行了试验。结果表明：水玻璃加入量达到海泡石质量分数的200％左右才能保证涂料的应用 强度；增加钠基膨润土和CMC的量不能提高涂料悬浮率，相反导致强度降低；高岭土提升涂料的悬浮率和强度；滑 石粉和石墨降低涂料的悬浮率和强度。 关键词：铝合金金属型；喷涂涂料；海泡石；水玻璃；钠基膨润土；CMC 中图分类号：TG221 ．1 文献标识码：A 文章编号：1001—4977(2015)08—0802—05 Study on Suspension Percentage and Strength of Sepiolite Spray Coating for Metal Molds for Aluminum Alloy Castings YANG Jian—xiong，HUANG Jin，L0NG Wei，ZHANG You—shou，XIA Lu，WANG Xiao—lu (Hubei Provincial Key Laboratory ofGreen Materials for Light Industry，Hubei University ofTechnology， Wuhan 430068，Hubei，China) Abstract：A water—base sepiolite spray coating used for meta1 molds for aluminum castings was developed,in which sepiolite，kaolin and graphite powder were used as base refractory aggregate and auxiliary refractory aggregate，respectively,binder is sodium silicate,suspension agents are sodium bentonite and sodium carboxymethYl cellulose fCMC1．The effects of various material addition in the coating on coating suspension percentage and strength were investigated．The results show that work strength ofthe coating could be ensured when sodium silicate addition amount was up to fⅥ 200％of sepiolite mass fraction,increasing the amount of sodium bentonite and CMC could less improve the suspension percentage．on the contrary,resulting in a low coating strength；the coating suspension percen