陶瓷纤维长度对复合精铸型壳抗弯强度与透气性的影响及增强行为
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摘要
为了分析纤维长度对陶瓷纤维增强硅溶胶型壳抗弯强度与透气性的影响及增强行为,采用1~6mm六种不同长度陶瓷纤维制备硅溶胶型壳试样。研究结果表明,陶瓷纤维长度对硅溶胶型壳强度和透气性的影响显著,随着陶瓷纤维长度的增加,型壳的抗弯强度先增大后减少,型壳的透气率先增大后减小再增大。当陶瓷纤维长度为4mm时,型壳的常温及焙烧后抗弯强度达到最大值,分别为2.97 MPa和6.84 MPa;型壳的透气率达到最大值2.90。当陶瓷纤维长度大于4mm时,纤维在型壳中分散性变差,纤维的桥联作用得不到有效发挥,型壳孔隙率减少,导致型壳强度和透气性变小。
In order to analyze the influence of fiber length on the bending strength and breathability of the ceramic fiber reinforced silica sol shell,the ceramic fibers with six different lengths from 1mm to 6mm were added to the silica sol slurry to reinforce shell.The results show that the length of the ceramic fiber has a significant effect on the strength and breathability of silica sol shell.With the increase of the ceramic fiber length,the bending strength of the shell increases first and then decreases,and the breathability of the shell increases first,then decreases and increases again.When the fiber length is 4 mm,the green strength and fired strength of the shell reach the maximum about 2.97 MPa and 6.84 MPa,respectively,and the breathability of the shell also reaches the maximum about 2.90.When the fiber length is more than 4mm,the dispersion of fiber in shell gets worse,and the influence of fiber bridging is not obviously effective.The porosity of the shell reduces,which leads to the decrease of the strength and breathability of the shell.
In order to analyze the influence of fiber length on the bending strength and breathability of the ceramic fiber reinforced silica sol shell,the ceramic fibers with six different lengths from 1mm to 6mm were added to the silica sol slurry to reinforce shell.The results show that the length of the ceramic fiber has a significant effect on the strength and breathability of silica sol shell.With the increase of the ceramic fiber length,the bending strength of the shell increases first and then decreases,and the breathability of the shell increases first,then decreases and increases again.When the fiber length is 4 mm,the green strength and fired strength of the shell reach the maximum about 2.97 MPa and 6.84 MPa,respectively,and the breathability of the shell also reaches the maximum about 2.90.When the fiber length is more than 4mm,the dispersion of fiber in shell gets worse,and the influence of fiber bridging is not obviously effective.The porosity of the shell reduces,which leads to the decrease of the strength and breathability of the shell.
引文
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[18]华源,连俊英,周太全.长径比对混杂纤维增强混凝土力学性能的影响[J].建筑材料学报,2005,8(1):71-76.HUA Y,LIAN J Y,ZHOU T Q.Relationship between the mechanical properties of hybrid fiber reinforced concrete and length/diameter aspect ratio of hybrid fiber[J].Journal of Building Materials,2005,8(1):71-76(in Chinese).
[19]王浩,刘向东,吕凯,等.短切玻璃纤维增强硅溶胶型壳强度的研究[J].特种铸造及有色合金,2014,34(6):633-636.WANG H,LIU X D,LV K,et al.Strength of short glass fiber-reinforced silicon sol shell for investment casting process[J].Special Casting&Nonferrous Alloys,2014,34(6):633-636(in Chinese).
[20]束德林,陈九磅,风仪,等.工程材料力学性能[M].北京:机械工业出版社,2007.SHU D L,CHEN J B,FENG Y,et al.Mechanical properties of engineering materials[M].Beijing:China Machine Press,2007(in Chinese).
[2]CHEN Y F,ZHENG S Q,TU J P,et al.Fracture characteristics of notched investment cast TiAl alloy through in situ SEM observation[J].Transactions of Nonferrous Metals Society of China,2012,22(10):2389-2394.
[3]樊振中,徐秀利,王玉灵,等.熔模精密铸造技术在航空工业的应用及发展[J].特种铸造及有色合金,2014,34(3):285-289.FAN Z Z,XU X L,WANG Y L,et al.Investment casting technology application and development in the aviation industry[J].Special Casting&Nonferrous Alloys,2014,34(3):285-289(in Chinese).
[4]周明智,朱春临,陈奇海,等.精密熔模铸造技术在雷达产品中的应用[J].电子机械工程,2013,29(4):46-48.ZHOU M Z,ZHU C L,CHEN Q H,et al.Application of investment casting to radar component manufacture[J].Electro-Mechanical Engineering,2013,29(4):46-48(in Chinese).
[5]姜不居.熔模铸造用石英粉粒度分布的研究[J].特种铸造及有色合金,1991(1):13-16.JIANG B J.Study on the size distribution of quartz powder in investment casting[J].Special Casting&Nonferrous Alloys,1991(1):13-16(in Chinese).
[6]SBORNICCHIA P,MONTESPERELLI G,INGO G M,et al.Advances in jewellery microcasting[J].Thermochimica Acta,2004,419(1-2):195-204.
[7]吕志刚,闫双景,张锡平,等.增强型快干硅溶胶的研制[J].特种铸造及有色合金,2003(6):47-49.LV Z G,YAN S J,ZHANG X P,et al.Development of enhanced fast drying colloidal silica[J].Special Casting&Nonferrous Alloys,2003(6):47-49(in Chinese).
[8]田培凤,吕志刚,季晓玲,等.一种新型快干增强硅溶胶的试验[J].铸造技术,2008,29(8):1066-1068.TIAN P F,LV Z G,JI X L,et al.The test of silica sol a new quick and enhanced[J].Foundry Technology,2008,29(8):1066-1068(in Chinese).
[9]TRAN T K,DONG J K.High strain rate effects on direct tensile behavior of high performance fiber reinforced cementitious composites[J].Cement and Concrete Composites,2014,45(4):186-200.
[10]孙爱芳,刘敏珊,董其伍.短切纤维增强复合材料拉伸强度的预测[J].材料研究学报,2008,22(3):333-336.SUN A F,LIU M S,DONG Q W.Prediction of tensile strength for short-fiber-reinforced composites[J].Chinese Journal of Materials Research,2008,22(3):333-336(in Chinese).
[11]王婕丽,林文松,姜自旺,等.纤维结构钼铜复合材料的制备及组织性能[J].中国有色金属学报,2014,24(1):174-178.WANG J L,LIN W S,JIANG Z W,et al.Fabrication and structure properties of fiber-structured Mo-Cu composites[J].The Chinese Journal of Nonferrous Metals,2014,24(1):174-178(in Chinese).
[12]LIU Q B,LEU M C,RICHARDS V L.Fracture toughness of ceramic moulds for investment casting with ice patterns[J].International Journal of Cast Metals Research,2007,20(1):14-24.
[13]王钊,卢德宏,蒋业华,等.玻璃纤维对陶瓷浆料的流动性及铸型强度的影响[J].特种铸造及有色合金,2012,32(6):546-549.WANG Z,LU D H,JIANG Y H,et al.Effect of glass fiber on the fluidity and casting strength of ceramic slurry[J].Special Casting&Nonferrous Alloys,2012,32(6):546-549(in Chinese).
[14]MAITY J.Development of high strength ceramic shell for investment casting[J].Indian Foundry Journal,2011,47(7):23-26.
[15]刘向东,吕凯,王浩,等.玻璃纤维增强硅溶胶型壳的强度及高温自重变形[J].特种铸造及有色合金,2014,34(9):958-961.LIU X D,LV K,WANG H,et al.Strength and hightemperature self-loaded deformation of glass fiber-reinforced shell for investment casting[J].Special Casting&Nonferrous Alloys,2014,34(9):958-961(in Chinese).
[16]吕凯,刘向东,王浩,等.短切硅酸铝纤维增强硅溶胶型壳的抗弯强度及高温自重变形[J].材料工程,2015,43(7):56-61.LV K,LIU X D,WANG H,et al.Bending strength and high-temperature self-loaded deformation of short aluminum silicate fiber-reinforced silicon sol shell[J].Journal of Materials Engineering,2015,43(7):56-61(in Chinese).
[17]嵇绍华,李永鹏,何锐,等.纤维长度对聚乙烯纤维增强水泥基复合材料强度和韧性的影响[J].混凝土,2014,20(1):46-48.JI S H,LI Y P,HE R,et al.Influence of fiber length on the strength and toughness of polytene fiber reinforced cementitious composite[J].Concrete,2014,20(1):46-48(in Chinese).
[18]华源,连俊英,周太全.长径比对混杂纤维增强混凝土力学性能的影响[J].建筑材料学报,2005,8(1):71-76.HUA Y,LIAN J Y,ZHOU T Q.Relationship between the mechanical properties of hybrid fiber reinforced concrete and length/diameter aspect ratio of hybrid fiber[J].Journal of Building Materials,2005,8(1):71-76(in Chinese).
[19]王浩,刘向东,吕凯,等.短切玻璃纤维增强硅溶胶型壳强度的研究[J].特种铸造及有色合金,2014,34(6):633-636.WANG H,LIU X D,LV K,et al.Strength of short glass fiber-reinforced silicon sol shell for investment casting process[J].Special Casting&Nonferrous Alloys,2014,34(6):633-636(in Chinese).
[20]束德林,陈九磅,风仪,等.工程材料力学性能[M].北京:机械工业出版社,2007.SHU D L,CHEN J B,FENG Y,et al.Mechanical properties of engineering materials[M].Beijing:China Machine Press,2007(in Chinese).