(1.上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200030；
2.華中理工大學(xué) 材料學(xué)院， 武漢 430074)
摘 要: 利用HST-2型消失模涂料高溫性能測(cè)試儀研究了涂料組成、 涂層厚度、透氣性、溫度等對(duì)聚苯乙烯熱解產(chǎn)物通過(guò)消失模涂層的傳輸特性的影響。結(jié)果表明: 增加云母粉、珠光粉加入量及涂層厚度，涂層透氣性下降，熱解產(chǎn)物傳輸曲線(xiàn)的峰值上升，傳輸時(shí)間增長(zhǎng)。探討了模樣熱解產(chǎn)物通過(guò)涂層的傳輸行為對(duì)消失模鋁鑄件孔隙率的影響。研究發(fā)現(xiàn)，熱解產(chǎn)物傳輸曲線(xiàn)峰值高、傳輸時(shí)間長(zhǎng)，有利于減少鋁件的孔隙率。當(dāng)熱解產(chǎn)物傳輸曲線(xiàn)的峰值及傳輸時(shí)間分別達(dá)到0.412kPa和48.3s以上時(shí)，鋁鑄件的針孔率可達(dá)到一級(jí)。實(shí)驗(yàn)結(jié)果表明，自制的HW-1涂料的傳輸性能可與美國(guó)Ashland涂料的相當(dāng)。
關(guān)鍵字: 鋁合金；消失模鑄造；熱解產(chǎn)物；傳輸特性
aluminum alloy casting in
lost foam process
DING Wen-jiang1，LUO Ji-rong2
（1.State Key Laboratory of Metal Matrix Composite，
Shanghai Jiaotong University，Shanghai 200030, China;
2.School of Materials，Huazhong University of
Science and Technology，Wuhan 430074, China）
Abstract:The effects of coating constituent，coating layer thickness，permeability and temperature on transfer behaviors of decomposition products through coating layer were studied with HST-2 instrument of high temperature permeability for lost foam coating. The results show that the peak values and transfer time increase with the increase of Zhuguang powder and mica content, coating thickness and with the decrease of permeability. The relationship between casting porosity and transfer behavior of decomposition products was research ed. It is pointed out that high peak value and long transfer time are helpful for decreasing the porosity of castings. When the peak value and transfer time are more than 0.412kPa and 48.3s，the rating of porosity of aluminum casting can reach grade 1. The results show that the transfer properties of self-developed HW-1 coating are as good as those of Ashland coating in American.
Key words: aluminum alloy; lost foam casting; decomposition products; transfer property
