Tape Casting Thin, Continuous, Homogenous, and Flexible Tapes of ZrB2

Using an organic solvent-based formulation, flexible and homogeneous ZrB2 tapes were cast for potential use as advanced aerospace exploration vehicles. Dispersant concentrations were optimized for attrition-milled ZrB2 powder using gravitational sedimentation and viscosity measurements. Tape cast slurry formulations with varying amounts of binder (6–8 vol%), plasticizer (7–11 vol%), and solids loading (20–23 vol%) were used to optimize the casting slurry. An optimal slurry formulation was determined based on cast tape uniform particle distribution and flexibility without cracking. Thermal gravimetric analysis of the optimized tape was used to create a binder burnout schedule that did not alter the tape structure or particle distribution. Our organic solvent-based tape casting approach results in minimum oxygen contamination after colloidal processing and robust cast tapes with a thickness of 280 μm and green density of ~41% theoretic density after binder burnout.

[1]  G. Hilmas,et al.  Pressureless Sintering of Zirconium Diboride: Particle Size and Additive Effects , 2008 .

[2]  Jun Li,et al.  High Thermal Conductivity Aluminum Nitride Substrates Prepared by Aqueous Tape Casting , 2006 .

[3]  M. Cima,et al.  Stress Development During Drying of Aqueous Zirconia Based Tape Casting Slurries Measured by Transparent Substrate Deflection Method , 2009 .

[4]  G. Hilmas,et al.  Pressureless Sintering of ZrB2–SiC Ceramics , 2007 .

[5]  K. Watari,et al.  Binder Burnout from Layers of Alumina Ceramics Under Centrifugal Force , 2006 .

[6]  D. Van Wie,et al.  The hypersonic environment: Required operating conditions and design challenges , 2004 .

[7]  Dongliang Jiang,et al.  Aqueous Tape Casting of Zirconium Diboride , 2009 .

[8]  D. Viswanath,et al.  Thermal degradation of poly(vinyl butyral) in alumina, mullite and silica composites , 1996 .

[9]  Dietrich Munz,et al.  What Can We Learn from R‐Curve Measurements? , 2007 .

[10]  Thomas H. Squire,et al.  Material property requirements for analysis and design of UHTC components in hypersonic applications , 2010 .

[11]  Y. Sakka,et al.  Dispersion Behavior of ZrB2 Powder in Aqueous Solution , 2007 .

[12]  Jingxian Zhang,et al.  Preparation of TiC ceramics through aqueous tape casting , 2005 .

[13]  Zhengkui Xu,et al.  Comparison of Water‐Based and Solvent‐Based Tape Casting for Preparing Multilayer ZnO Varistors , 2008 .

[14]  E. Opila,et al.  UHTCs: Ultra-High Temperature Ceramic Materials for Extreme Environment Applications , 2007 .

[15]  Erica L. Corral,et al.  Ultra High Temperature Ceramics for Hypersonic Vehicle Applications , 2006 .

[16]  S. Guo,et al.  Densification of ZrB2-based composites and their mechanical and physical properties: A review , 2009 .

[17]  R. Moreno,et al.  Tape casting of non-aqueous silicon nitride slips , 2000 .

[18]  J. Heinrich,et al.  Aqueous tape casting of silicon nitride , 2002 .

[19]  T. Chartier,et al.  Mechanical and lamination properties of alumina green tapes obtained by aqueous tape-casting , 1999 .