95氧化铝陶瓷埋粉热脱脂过程粘粉的控制
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摘要
低压注射成型制备95氧化铝陶瓷在埋粉热脱脂过程会发生粘粉现象,严重影响陶瓷零件性能,本文提出了一种基于大小粒径混合埋粉对粘粉现象的控制方法,并与传统方式进行了对比分析,混合粒径埋粉在保证了烧成后95氧化铝陶瓷强度和耐压性能的前提下,消除了粘粉现象。该方法具有操作简便、无杂质引入等优点。此外,基于脱脂过程的物相与表面自由能变化,讨论了粘粉的形成机制以及混合粒径埋粉消除粘粉的原理。
The powder adhering that occurred during debinding process of the low-pressure injection molded 95 alumina was a threat to its performance. In this paper, a method of using debinding powder mixed with particles of different sizes for solving powder adhering was presented, and a comparison was done between this and the traditional method. Debinding with the mixed powder entirely prevented the powder adhering on the surface and ensured the capability of 95 alumina ceramic as well, improving its bending strength and dielectric breakdown strength. The debinding method with the mixed powder has the advantages of simple operation and no impurity. Additionally,based on the phase transformation and the change of the surface free energy during the debinding process, this paper discussed the mechanism of the powder adhering and the causation of the powder adhering prevention.
The powder adhering that occurred during debinding process of the low-pressure injection molded 95 alumina was a threat to its performance. In this paper, a method of using debinding powder mixed with particles of different sizes for solving powder adhering was presented, and a comparison was done between this and the traditional method. Debinding with the mixed powder entirely prevented the powder adhering on the surface and ensured the capability of 95 alumina ceramic as well, improving its bending strength and dielectric breakdown strength. The debinding method with the mixed powder has the advantages of simple operation and no impurity. Additionally,based on the phase transformation and the change of the surface free energy during the debinding process, this paper discussed the mechanism of the powder adhering and the causation of the powder adhering prevention.
引文
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[19]杜继实,徐万里,唐兵华,等.Y2O3埋粉对95%氧化铝热压铸瓷坯脱蜡粘粉的控制[J].人工晶体学报,2018,47(3):570-577.DU J S,XU W L,TANG B H,et al.Journal of Synthetic Crystals,2018,47(3):570-577.
[20]SHIVASHANKAR T S,GERMAN R M.Effective length scale for predicting solvent-debinding times of components produced by powder injection-molding[J].Journal of the American Ceramic Society,1999,82(5):1146-1152.
[21]GERMAN R M.Theory of thermal debinding[J].Int J Powder Metall,1987,23(4):237-245.
[22]BAO Y,EVANS J R G.Kinetics of capillary extraction of organic vehicle from ceramic bodies.Part I:Flow in porous media[J].Journal of the European Ceramic Society,1991,8(2):81-93.
[23]BAO Y,EVANS J R G.Kinetics of capillary extraction of organic vehicle from ceramic bodies.Part II:Partitioning between porous media[J].Journal of the European Ceramic Society,1991,8(2):95-105.
[24]杨现锋,谢志鹏,刘冠伟,等.埋粉对热脱脂速率和传质过程的影响[J].稀有金属材料与工程,2009,38(2):138-141.YANG X F,XIE Z P,LIU G W,et al.Rare Metal Materials and Engineering,2009,38(2):138-141.
[25]BAIK S,WHITE C L.Anisotropic calcium segregation to the surface of Al2O3[J].Journal of the American Ceramic Society,1987,70(9):682-688.
[26]NIKOLIC N,NIKOLIC M V,RADIC R,et al.Sintering as a process of transport of activated volume[J].Science of Sintering,2002,34(1):53-56.
[2]JAYASINGHE S N,EDIRISINGHE M J.Novel forming of single and multiple ceramic micro-channels[J].Applied Physics A:Materials Science&Processing,2005,80(4):701-702.
[3]DOAN T B,LEBEYT,FRANOIS F,et al.Cold isostatic pressing of screen-printed dielectric for power electronics passive component integration[J].Journal of Material Science:Material Electron,2015,26(4):2493-2500.
[4]JAMES P J.Principles of isostatic pressing[J].Isostatic Pressing of Powders,1975,7603:54-64.
[5]HOWATT G N,BRECKENZIDGE R G,BROWNLOW J M,et al.Fabrication of thin ceramic sheets for capacitors[J].Journal of the American Ceramic Society,1947,30(8):237-242.
[6]赵林,刘亮,魏红康,等.流延成型法制备透明氧化铝陶瓷烧结性能的研究[J].陶瓷学报,2015,36(2):132-137.ZHAO L,LIU L WEI H K,et al.Journal of Ceramics,2015,36(2):132-137.
[7]MEDVEDOVSKI E,PELTSMAN M.Low pressure injection moulding mass production technology of complex shape advanced ceramic components[J].Advances in Applied Ceramics,2012,111(5&6):333-344.
[8]宋明,谢志鹏,温佳鑫,等.先进陶瓷注射成型的脱脂工艺进展[J].陶瓷学报,2015,36(2):119-126.SONG M,XIE Z P,WEN J X,et al.Journal of Ceramics,2015,36(2):119-126.
[9]MARTIN T,JAROSLAV C.Effect of activated carbon bed on binder removal from ceramic injection moldings[J].Journal of the American Ceramic Society,2001,84(3):675-677.
[10]WRIGHT J K,EVANS J R G.Removal of organic vehicle from moulded ceramic bodies by capillary action[J].Ceramics International,1991,17(2):79-87.
[11]KRUG S,EVANS J R G,TER MAAT J H H,et al.Effect of polymer crystallinity on morphology in ceramic injection molding[J].Journal of the American Ceramic Society,2001,84(12):2750-2756.
[12]KRUG S,EVANS J R G,TER MAAT J H H,et al.Residual stresses and cracking in large ceramic injection mouldings subjected to different solidification schedules[J].Journal of the European Ceramic Society,2000,20(14&15):2535-2541.
[13]HESSE W,TER MAAT J H H,TRUEBENBACH P,et al.Injection molding and catalytic debinding of zirconia(Y-TZP)ceramics with a polyacetal based binder system[J].Ceramics Transaction,1995,41:309-313.
[14]CHARTIER T,FERRATO M,BAUMARD J F,et al.Supercritical debinding of injection molded ceramics[J].Journal of the American Ceramic Society,1995,78(7):1787-1792.
[15]CIMA M J,LEWIS J A,DEVOE A D,et al.Binder distribution in ceramic greenware during thermolysis[J].Journal of the American Ceramic Society,1989,72(7):1192-1199.
[16]SONG J H,EDIRISINGHE M J,EVANS J R G,et al.Mathematical modelling of binder removal from plasticallyformed engineering ceramics[J].Advances in Computational Mathematics,1996,6(3&4):325-331.
[17]SHI Z,GUO Z X,SONG J H,et al.A diffusion-controlled kinetic model for binder burnout in a powder compact[J].Acta Materialia,2002,50(8):1937-1950.
[18]BARONE M R,ULICNY J C.Liquid-phase transport during removal of organic binders in injection-molded ceramics[J].Journal of the American Ceramic Society,1990,73(11):3323-3333.
[19]杜继实,徐万里,唐兵华,等.Y2O3埋粉对95%氧化铝热压铸瓷坯脱蜡粘粉的控制[J].人工晶体学报,2018,47(3):570-577.DU J S,XU W L,TANG B H,et al.Journal of Synthetic Crystals,2018,47(3):570-577.
[20]SHIVASHANKAR T S,GERMAN R M.Effective length scale for predicting solvent-debinding times of components produced by powder injection-molding[J].Journal of the American Ceramic Society,1999,82(5):1146-1152.
[21]GERMAN R M.Theory of thermal debinding[J].Int J Powder Metall,1987,23(4):237-245.
[22]BAO Y,EVANS J R G.Kinetics of capillary extraction of organic vehicle from ceramic bodies.Part I:Flow in porous media[J].Journal of the European Ceramic Society,1991,8(2):81-93.
[23]BAO Y,EVANS J R G.Kinetics of capillary extraction of organic vehicle from ceramic bodies.Part II:Partitioning between porous media[J].Journal of the European Ceramic Society,1991,8(2):95-105.
[24]杨现锋,谢志鹏,刘冠伟,等.埋粉对热脱脂速率和传质过程的影响[J].稀有金属材料与工程,2009,38(2):138-141.YANG X F,XIE Z P,LIU G W,et al.Rare Metal Materials and Engineering,2009,38(2):138-141.
[25]BAIK S,WHITE C L.Anisotropic calcium segregation to the surface of Al2O3[J].Journal of the American Ceramic Society,1987,70(9):682-688.
[26]NIKOLIC N,NIKOLIC M V,RADIC R,et al.Sintering as a process of transport of activated volume[J].Science of Sintering,2002,34(1):53-56.