以先驱体转化法制备的SiCO陶瓷粉体为原材料,采用热重法研究了粉体在干燥空气中的氧化性能.采用液态聚碳硅烷裂解制备的SiCO陶瓷粉体平均粒径为7 μm,氧化处理温度分别为:900℃、950℃、1000℃、1050℃,氧化时间均为4 h.结果表明:液态聚碳硅烷裂解制备的SiC1.12O<0.12>陶瓷粉体在1173～1373 K、干燥空气中,氧化增重表现为典型的2阶段变化规律:900℃下的前80 min至1050℃下的前20 min时间内,材料氧化表现为快速增重趋势;随后较长的氧化时间里,材料内部气孔的氧化由于封孔而停止,氧化反应主要由扩散控制,样品增重不太明显.经计算SiCO陶瓷粉体的氧化活化能为121 kJ/mol,并在此基础上推导了热重法与厚度测量法获得的2种氧化速率常数的转变公式.
参考文献
| [1] | Jack K H.Sialons and related nitrogen ceramics[J].Journal of Materials Science,1976,11(6):1135-1158. |
| [2] | Ding S Q,Zhu S M,Zeng Y P,et al.Effect of Y2O3 addition on the properties of reaction-bonded porous SiC ceramics[J].Ceramic International,2006,32(4):461-466. |
| [3] | Yajima S,Hasegawa Y,Okamura K,et al.Development of high tensile strength silicon carbide fibre using an organosilicon polymer precursor[J].Nature,1978,273(5):525-527. |
| [4] | Clade J,Seider E,Sporn D.A new type of precursor for fibers in the system Si -C[J].Journal of European Ceramic Society,2005,25(2/3):123-127. |
| [5] | Bill J,Heimann D.Polymer-derived ceramic coatings on C/CSiC composites[J].Journal of European Ceramic Society,1996,16(10):1115-1120. |
| [6] | Zbigniew S R.A process for Cf/SiC composites using liquid polymer infiltration[J].Journal of American Ceramic Society,2001,84(10):2235-2239. |
| [7] | Sun Q H,Xu K T,Jacky W Y,et al.Nanostructured magnetoceramics from hyperbranched polymer precursors[J].Materials Science and Engineering C,2001,16(1/2):107-112. |
| [8] | Linan A,Ralf R,Christoph K,et al.Newtonian viscosity of amorphous silicon carbonitride at high temperature[J].Journal of American Ceramic Society,1998,81(5):1349-1352. |
| [9] | Rail R,Lutz M R,Linan A,et al.Amorphous silicoboron carbonitride ceramic with very high viscosity at temperatures above 1500℃[J].Journal of American Ceramic Society,1998,81(12):3341-3344. |
| [10] | Wang Y G,Fan Y,Zhang L G,et al.Polymer-derived SiAICN ceramics resist oxidation at 1400℃[J].Scripta Materialia,2006,55(4):295-297. |
| [11] | Wang Y G,Linen A,Fan Y,et al.Oxidation of polymerderived SiAICN ceramics[J].Journal of American Ceramic Society,2005,88(11):3075-3080. |
| [12] | Sandeep R S,Rishi R.Mechanical properties of a fully dense polymer derived ceramic made by a novel pressure casting process[J].Acta Materialia,2002,50(16):4093-4103. |
| [13] | Lavanya B,Fan Y,Zhang L G,et al.Oxidation behavior of a fully dense polymer-derived amorphous silicon earbonitride ceramic[J].Journal of American Ceramic Society,2004,87(3):483-486. |
| [14] | Thorley M,Banks R.Kinetics and mechanism of oxidation of silicon nitride bonded silicon carbide ceramic[J].Journal of Thermal Analysis and Calorimetry,1994,42(4):811-822. |
| [15] | Li H B,Zhang L T,Cheng L F,et al.Polymer-ceramic conversion of a highly branched liquid polycarbosilane for SiCbased ceramics[J].Journal of Materials Science,2008,43(8):2806-2811. |
| [16] | Sandeep R S,Atanu S,Rishi R.Influence of distributed particle size on the determination of the parabolic rate constant for oxidation by the powder method[J].Journal of American Ceramic Society,2003,86(2):351-353. |
| [17] | Jia Q L,Zhang H J,Li S P,et al.Effect of particle size on oxidation of silicon carbide powders[J].Ceramic International,2007,33(2):309-313. |
| [18] | Porz F,Thummler F.Oxidation mechanism of porous silicon nitride[J].Journal of Materials Science,1984,19(4):1283-1295. |
| [19] | Rishi R,Linen A,Sandeep S,et al.Oxidation kinetics of an amorphous silicon carbonitride ceramic[J].Journal of American Ceramic Society,2001,84(8):1803-1810. |
| [20] | 武七德,童元丰.碳化硅材料的氧化及抗氧化研究[J].陶瓷科学与艺术,2002,36(1):7-13.Wu Qide,Tong Yuanfeng.Study on the oxidation mechanism and the resistance to oxidation of SiC materials[J].Ceramic Science &.Art,2002,36(1):7-13. |
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