發(fā)布時間：2018-10-17 15:22

【摘要】：為了提高熔模鑄造硅溶膠型殼的性能,向涂料中添加硅酸鋁纖維制備纖維增強熔模鑄造型殼試樣。對不同纖維加入量條件下所獲得的纖維增強型殼試樣的常溫及焙燒后抗彎強度、高溫自重變形量的變化規(guī)律進行研究,并利用SEM觀察型殼試樣斷口形貌。結果表明:隨硅酸鋁纖維加入量從0.2%~1.0%(質量分數(shù),下同)變化,其常溫抗彎強度顯著增大,高溫自重變形量減小;纖維加入量為1.0%時,試樣的常溫抗彎強度較未增強的試樣提高了47%,而高溫自重變形減少約50%。采用0.2%~1.0%的硅酸鋁纖維增強后,復合型殼焙燒后強度至少提高39%。斷口SEM形貌觀察分析結果表明,纖維增強硅溶膠型殼試樣受力破壞失效主要由于硅溶膠凝膠膜的斷裂、硅酸鋁纖維拔出、斷裂及脫粘等綜合作用所致。
[Abstract]:In order to improve the properties of silica sol mold shell in investment casting, fiber reinforced investment casting mold shell samples were prepared by adding aluminum silicate fiber to coating. The changes of bending strength and weight deformation at room temperature and calcination of fiber reinforced shell samples obtained under different fiber content were studied. The fracture morphology of shell specimens was observed by SEM. The results show that the flexural strength at room temperature increases significantly and the deformation of weight at high temperature decreases with the addition of aluminum silicate fiber from 0.2% to 1.0% (mass fraction), and when the fiber content is 1.0%, The flexural strength of the specimen at room temperature is increased by 47% than that of the specimen without reinforcement, while the deformation of dead weight at high temperature is reduced by about 50%. The strength of the composite shell was increased by at least 39% after calcination with 0.2% aluminum silicate fiber and 1.0% aluminum silicate fiber. The results of SEM observation and analysis show that the failure of fiber reinforced silica sol shell specimens is mainly caused by the fracture of silica sol gel film, the pull-out, fracture and debonding of aluminum silicate fiber.
【作者單位】： 內蒙古工業(yè)大學材料科學與工程學院;
【基金】：春暉計劃資助項目(Z2011-062)
【分類號】：TG249.5;TG22

【共引文獻】

相關期刊論文 前8條

1 趙筠;廉慧珍;金建昌;;鋼-混凝土復合的新模式——超高性能混凝土(UHPC/UHPFRC)之二:配制、生產與澆筑,水化硬化與微觀結構,力學性能[J];混凝土世界;2013年11期

2 王月;安明U，

本文編號：2277099