添加V_2O_5对SiC-Al_2O_3泡沫陶瓷性能的影响
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摘要
为在较低温度下制备出性能良好的复合泡沫陶瓷,以工业碳化硅粉(≤0.074 mm,w(SiC)≥92.0%)和电熔白刚玉粉(≤0.074 mm,w(Al_2O_3)≥99.0%)为主要原料,采用有机泡沫浸渍法,在1 350℃保温2 h制备了SiC-Al_2O_3泡沫陶瓷试样,研究了烧结助剂V_2O_5添加量(外加质量分数分别为1%、2%和3%)对泡沫陶瓷试样外观形貌、物相组成、烧结性能、常温耐压强度和抗热震性的影响。结果表明:添加V_2O_5显著影响试样的显气孔率和耐压强度,当添加1%(w)V_2O_5时,试样的显气孔率、耐压强度达到最大值,分别是78.90%和0.35MPa;当V_2O_5添加量为2%(w)时,试样的抗热震性最佳,1 000℃至室温的热震循环次数达到49次(45次空冷+4次水冷);试样中均有新相SiO_2和Al_6Si_2O_(13)生成,利于提高试样的强度。
This work aims at preparing composite ceramic foams with good properties at relatively low temperatures. SiC-Al_2O_3 ceramic foams specimens were prepared at 1 350 ℃ for 2 h from the powders of commercial silicon carbide( ≤0. 074 mm,w( SiC) ≥92. 0%) and white fused corundum( ≤0. 074 mm,w( Al_2O_3) ≥99. 0%) via a polymeric sponge impregnation method. The influences of V_2O_5 extra-additions( 1%,2%,and 3% by mass) on the appearance,phase composition,sintering properties,cold compressive strength and thermal shock resistance of as-prepared ceramic foams were investigated. The results show that: the addition of V_2O_5 remarkably influences the apparent porosity and compressive strength of the specimens; the specimen with 1% V_2O_5 has the highest AP and CCS,78. 90% and 0. 35 MPa,respectively; the specimen with 2% V_2O_5 has the best thermal shock resistance,49 cycles from 1 000 ℃ to room temperature including 45 in air and then 4 in water cooling; new phase SiO_2 and Al_6Si_2O_(13) can be detected in all specimens,which improve the strength.
This work aims at preparing composite ceramic foams with good properties at relatively low temperatures. SiC-Al_2O_3 ceramic foams specimens were prepared at 1 350 ℃ for 2 h from the powders of commercial silicon carbide( ≤0. 074 mm,w( SiC) ≥92. 0%) and white fused corundum( ≤0. 074 mm,w( Al_2O_3) ≥99. 0%) via a polymeric sponge impregnation method. The influences of V_2O_5 extra-additions( 1%,2%,and 3% by mass) on the appearance,phase composition,sintering properties,cold compressive strength and thermal shock resistance of as-prepared ceramic foams were investigated. The results show that: the addition of V_2O_5 remarkably influences the apparent porosity and compressive strength of the specimens; the specimen with 1% V_2O_5 has the highest AP and CCS,78. 90% and 0. 35 MPa,respectively; the specimen with 2% V_2O_5 has the best thermal shock resistance,49 cycles from 1 000 ℃ to room temperature including 45 in air and then 4 in water cooling; new phase SiO_2 and Al_6Si_2O_(13) can be detected in all specimens,which improve the strength.
引文
[1]徐勇,邹国荣.泡沫陶瓷制备工艺研究进展[J].耐火材料,2017,51(5):358-365.
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[3]严李,田蒙奎,秦建良,等.Si O2/Al2O3复合多孔陶瓷膜支撑体的制备[J].中国陶瓷,2015,51(5):58-63.
[4]MA B Y,LI Y,LIU G Q,et al.Preparation and properties of Al2O3-Mg Al2O4ceramic foams[J].Ceram Int,2015,41(2):3237-3244.
[5]马战红,任凤章,赵培峰.添加剂对Si C-Al2O3陶瓷过滤器性能的影响[J].中国陶瓷,2009,45(8):21-23.
[6]LI J H,MA H W,HUANG W H.Effect of V2O5on the properties of mullite ceramics synthesized from high-aluminum fly ash and bauxite[J].J Hazard Mater,2009,166(2-3):1535-1539.
[7]陈敏,于景坤,王楠.耐火材料与燃料燃烧[M].沈阳:东北大学出版社,2005:13-35.
[8]MA B Y,LI Y,LIU G Q,et al.Effect of production process parameters on manufacture and properties of porous ceramic based on Al2O3[J].Refract Ind Ceram,2015,55(6):573-580.
[9]马北越,赵彦孛,李东旭,等.原料配比对聚合物模板法制备Si C-Al2O3多孔陶瓷性能的影响[J].耐火材料,2017,51(3):177-180.
[10]尹月,马北越,张博文,等.添加La2O3对粉煤灰合成Al2O3-Si C复合粉体的影响[J].材料导报,2017,31(4):111-114.
[11]曹亚平,鄢文,李楠.Si-Si C复合粉添加量对低碳镁碳耐火材料性能的影响[J].耐火材料,2016,50(3):170-173.
[2]尹月,马北越,张博文,等.氧化物多孔陶瓷研究新进展[J].耐火材料,2016,50(5):393-400.
[3]严李,田蒙奎,秦建良,等.Si O2/Al2O3复合多孔陶瓷膜支撑体的制备[J].中国陶瓷,2015,51(5):58-63.
[4]MA B Y,LI Y,LIU G Q,et al.Preparation and properties of Al2O3-Mg Al2O4ceramic foams[J].Ceram Int,2015,41(2):3237-3244.
[5]马战红,任凤章,赵培峰.添加剂对Si C-Al2O3陶瓷过滤器性能的影响[J].中国陶瓷,2009,45(8):21-23.
[6]LI J H,MA H W,HUANG W H.Effect of V2O5on the properties of mullite ceramics synthesized from high-aluminum fly ash and bauxite[J].J Hazard Mater,2009,166(2-3):1535-1539.
[7]陈敏,于景坤,王楠.耐火材料与燃料燃烧[M].沈阳:东北大学出版社,2005:13-35.
[8]MA B Y,LI Y,LIU G Q,et al.Effect of production process parameters on manufacture and properties of porous ceramic based on Al2O3[J].Refract Ind Ceram,2015,55(6):573-580.
[9]马北越,赵彦孛,李东旭,等.原料配比对聚合物模板法制备Si C-Al2O3多孔陶瓷性能的影响[J].耐火材料,2017,51(3):177-180.
[10]尹月,马北越,张博文,等.添加La2O3对粉煤灰合成Al2O3-Si C复合粉体的影响[J].材料导报,2017,31(4):111-114.
[11]曹亚平,鄢文,李楠.Si-Si C复合粉添加量对低碳镁碳耐火材料性能的影响[J].耐火材料,2016,50(3):170-173.