基于SLS/CIP工艺SiC陶瓷的制备及其性能
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摘要
以喷雾干燥的SiC-Al_2O_3-Y_2O_3造粒粉为原料,使用机械混合法得到复合粉体,通过激光选区烧结/冷等静压技术并结合液相烧结工艺制备出SiC陶瓷,对SiC陶瓷的物相组成、显微结构、抗弯强度及密度进行表征。结果表明:喷雾造粒粉平均粒径为39.43μm,球形度较高,流动性良好,适用于SLS成型;SLS成型最优参数为激光功率7W、扫描间距0.15mm、扫描速率2200mm/s、单层层厚0.15mm且CIP压力为80MPa时, SiC陶瓷素坯的性能最佳,抗弯强度为(2.23±0.10)MPa,密度为(1.31±0.05)g/cm~3;在1950℃下烧结2h后,样品发生了致密化,SiC陶瓷密度为(1.95±0.17)g/cm~3,相对密度为(60.81±5.31)%,抗弯强度为(55.43±4.04)MPa。
With the spray-dried SiC-Al_2O_3-Y_2O_3 powder as raw material, composite powder prepared by mechanical mixing was used to fabricate SiC ceramics by selective laser sintering/cold isostatic pressing combined with liquid phase sintering.The material phase composition, microstructure, flexural strength and density of SiC ceramics were characterized. The results show that spray-dried powder has an average diameter of 39.43μm with fine sphericity and flowability, which is suitable for SLS process. With the optimum parameters(laser power of 7 W, scanning speed of 2200 mm/s, scanning space of 0.15 mm and layer thickness of 0.15 mm) and CIP pressure of 80 MPa, the green bodies show the superior quality with flexural strength of(2.23±0.10)MPa and bulk density of(1.31±0.05)g/cm~3. After being sintered at 1950℃ for 2 h, samples are densified that the bulk density and relative density of SiC ceramics are(1.95±0.17)g/cm~3 and(60.81±5.31)%, respectively and the flexural strength is(55.43±4.04)MPa.
With the spray-dried SiC-Al_2O_3-Y_2O_3 powder as raw material, composite powder prepared by mechanical mixing was used to fabricate SiC ceramics by selective laser sintering/cold isostatic pressing combined with liquid phase sintering.The material phase composition, microstructure, flexural strength and density of SiC ceramics were characterized. The results show that spray-dried powder has an average diameter of 39.43μm with fine sphericity and flowability, which is suitable for SLS process. With the optimum parameters(laser power of 7 W, scanning speed of 2200 mm/s, scanning space of 0.15 mm and layer thickness of 0.15 mm) and CIP pressure of 80 MPa, the green bodies show the superior quality with flexural strength of(2.23±0.10)MPa and bulk density of(1.31±0.05)g/cm~3. After being sintered at 1950℃ for 2 h, samples are densified that the bulk density and relative density of SiC ceramics are(1.95±0.17)g/cm~3 and(60.81±5.31)%, respectively and the flexural strength is(55.43±4.04)MPa.
引文
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[26] MEDRAJ M,HAMMOND R,PARVEZ M A,et al.High temperature neutron diffraction study of the Al2O3-Y2O3 system [J].Journal of the European Ceramic Society,2006,26(16):3515-3524.
[2] DECKERS J,VLEUGELS J, KRUTH J P.Additive manufac-turing of ceramics:a review [J].Journal of Ceramic Science and Technology,2014,5(4):245-260.
[3] 吴甲民,陈安南,刘梦月,等.激光选区烧结用陶瓷材料的制备及其成型技术[J].中国材料进展,2017,36(增刊1):575-582. WU J M,CHEN A N,LIU M Y,et al.Preparation of ceramic materials used for selective laser sintering and related forming methods [J].Materials China,2017,36(Suppl 1):575-582.
[4] CHEN A N,WU J M,LIU K,et al.High-performance ceramic parts with complex shape prepared by selective laser sintering:a review [J].Advances in Applied Ceramics,2018,117(2):100-117.
[5] DECKERS J P,DECKERS J P,SHAHZAD K,et al.Shaping ceramics through indirect selective laser sintering [J].Rapid Prototyping Journal,2016,22(3):544-558.
[6] 吴甲民,陈敬炎,陈安南,等.陶瓷零件增材制造技术及在航空航天领域的潜在应用[J].航空制造技术,2018,117(2):100-117. WU J M,CHEN J Y,CHEN A N,et al.Additive manufacturing of ceramic components and its potential application in aerospace field [J].Aeronautical Manufacturing Technology,2018,117(2):100-117.
[7] LIU J,ZHANG B,YAN C,et al.The effect of processing parameters on characteristics of selective laser sintering dental glass-ceramic powder [J].Rapid Prototyping Journal,2010,16(2):138-145.
[8] DECKERS J,SHAHZAD K,VLEUGELS J,et al.Isostatic pressing assisted indirect selective laser sintering of alumina components [J].Rapid Prototyping Journal,2012,18(5):409-419.
[9] 史玉升,刘凯,李晨辉,等.氧化锆零件激光选区烧结/冷等静压复合成形技术[J].机械工程学报,2014,50(21):118-123. SHI Y S,LIU K,LI C H,et al.Additive manufacturing of zirconia parts via selective laser sintering combined with cold isostatic pressing[J].Journal of Mechanical Engineering,2014,50(21):118-123.
[10] 张玲洁.颗粒、晶须强韧化碳化硅陶瓷及其在密封环中的应用[D].浙江:浙江大学,2012. ZHANG L J.Preparation of silicon carbide ceramics reinforced by particles or/and whiskers and their application in mechanical seals[D].Hangzhou: Zhejiang University,2012.
[11] 纪宏超,张雪静,裴未迟,等.陶瓷3D打印技术及材料研究进展[J].材料工程,2018,46(7):19-28. JI H C,ZHANG X J,PEI W C,et al.Research progress in ceramic 3D printing technology and material development[J].Journal of Materials Engineering,2018,46(7):19-28.
[12] MAMORU O,HUMIHIKO T.Pressureless sintering of SiC [J].Journal of the American Ceramic Society,1982,6(1):92.
[13] 戴培赟,周平,王泌宝,等.碳化硅致密陶瓷材料研究进展[J].中国陶瓷,2012,48(4):1-6. DAI P Y,ZHOU P,WANG M B,et al.Development of preparation of silicon carbide dense ceramics [J].China Ceramics,2012,48(4):1-6.
[14] LANGE F F.Hot-pressing behavior of silicon carbide powders with additions of aluminium oxide [J].Journal of Materials Science,1975,10(2):314-320.
[15] PADTURE N P.In situ-toughened silicon carbide [J].Journal of the American Ceramic Society,1994,77(2):519-523.
[16] KIM Y W,MAMORU M,HIDEYUKI E,et al.Effect of initial alpha-phase content on microstructure and mechanical properties of sintered silicon carbide[J].Journal of the American Ceramic Society,1998,81(12):3136-3140.
[17] 郑玉惠.激光选区烧结碳化硅颗粒预制体成形工艺研究[D].南昌:南昌航空大学,2009. ZHENG Y H.Investigation on preparation of SiC particulates performed by selective laser sintering [D].Nanchang:Nanchang Hangkong University,2009.
[18] 刘梦月,吴甲民,陈安南,等.激光选区烧结用SiC复合粉体制备及其成型特性研究[J].上海航天,2016,33(5):125-131. LIU M Y,WU J M,CHEN A N,et al.Study on fabrication and properties of SiC composite powders for selective laser sintering [J].Aerospace Shanghai,2016,33(5):125-131.
[19] NELSON J C,VAIL N K,BARLOW J W,et al.Selective laser sintering of polymer-coated silicon-carbide powders[J].Industrial & Engineering Chemistry Research,1995,34(5):1641-1651.
[20] HON K K B,GILL T J.Selective laser sintering of SiC/polyamide composites[J].CIRP Annals-Manufacturing Techn-ology,2003,52(1):173-176.
[21] 徐文武,史玉升,黄树槐,等.选择性激光烧结碳化硅及铝合金氧化入渗[J].中国有色金属学报,2006,16(11):1950-1954. XU W W,SHI Y S,HUANG S H,et al.Selective laser sintering of SiC and oxidative infiltration of Al-alloys [J].The Chinese Journal of Nonferrous Metals,2006,16(11):1950-1954.
[22] KRUTH J P,LEVY G,KLOCKE F,et al.Consolidation phenomena in laser and powder-bed based layered manufacturing [J].CIRP Annals Manufacturing Technology,2007,56(2):730-759.
[23] 夏思婕.碳化硅粉末激光选区烧结/冷等静压复合工艺及其后处理研究[D].武汉:华中科技大学,2016. XIA S J.Fabricating silicon carbide parts by selective laser sintering/cold isostatic pressing and post process [D].Wuhan:Huazhong University of Science and Technology,2016.
[24] CAO X Q,VASSEN R,SCHWARTZ S,et al.Spray-drying of ceramics for plasma-spray coating [J].Journal of the European Ceramic Society,2000,20(14):2433-2439.
[25] 魏青松,唐萍,吴甲民,等.激光选区烧结多孔堇青石陶瓷微观结构及性能[J].华中科技大学学报(自然科学版),2016,44(6): 46-51. WEI Q S,TANG P,WU J M,et al.Microstructure and mech-anical performance of porous cordierite ceramic parts manuf-actured by selective laser sintering[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2016,44(6): 46-51.
[26] MEDRAJ M,HAMMOND R,PARVEZ M A,et al.High temperature neutron diffraction study of the Al2O3-Y2O3 system [J].Journal of the European Ceramic Society,2006,26(16):3515-3524.
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