石英砂改善陶瓷模具石膏性能研究

Study on Performances of Ceramic Model-Gypsum Improved by Silicate Sand

研究了0～0.4 mm石英砂对模具石膏凝结时间、抗折强度、吸水率及磨损率的影响,并采用MIP测试技术分析石膏-石英砂增强机理.结果表明：当石英砂掺量为10％时,模具石膏2h及干态抗折强度增加显著且均达到峰值,分别为3.29 MPa、6.36 MPa,较空白样增幅高达20.73％、24.95％。随着石英砂掺量的增加,模具石膏的磨损率逐渐降低,耐磨性逐渐增强,当掺量为20％时,其磨损率为0.96％,较空白样降幅高达72％。吸水率则随着石英砂掺量的增加有小幅度降低.因此,为满足模具石膏的综合性能,石英砂的最佳掺量为10％。

The performances of setting time,flexural strength,water absorption and abrasion rate of modelgypsum were studied by the addition of silicate sand（0-0.4 mm）.The mechanism was analyzed by MIP.The result shows that the 2 h and dry flexural strength of the model-gypsum increased significantly to the maximum at the ratio of 10％.The flexural strength were 3.29 MPa and 6.36 MPa which were increased by 20.73％ and 24.95％ compared to the blank samples,respectively.The abrasion rate of model-gypsum was decreased by the content growing of silicate sand.The abrasion-resistance was enhanced remarkably by the content increasing.The abrasion rate was 0.96％ at the ratio of 20％ which was decreased eminently by 72％ compared to the blank samples.However,the water absorption was little reduced by the addition increasing of silicate sand.Therefore,to meet the comprehensive properties of ceramic model-gypsum,the best content of silicate sand is 10％.