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High Compressive Strength (high + compressive_strength)
Selected AbstractsPreparation of Titanium Foams by Slip Casting of Particle Stabilized Emulsions,ADVANCED ENGINEERING MATERIALS, Issue 8 2009Bram Neirinck Bulk titanium foams were prepared by emulsion templating during slip casting. The emulsion template was stabilized using partially hydrophobized titanium particles while the continuous phase consisted of a titanium hydride powder suspension. Sintering was performed in inert atmosphere. The use of titanium hydride resulted in lower sintering temperatures and denser, stronger struts. Both homogeneous foams with high compressive strength and structures with a gradient in pore size were obtained. [source] Influence of powder particle size distribution on complex viscosity and other properties of acrylic bone cement for vertebroplasty and kyphoplasty,JOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 1 2006Lidia Hernández Abstract For use in vertebroplasty and kyphoplasty, an acrylic bone cement should possess many characteristics, such as high radiopacity, low and constant viscosity during its application, low value of the maximum temperature reached during the polymerization process (Tmax), a setting time (tset) that is neither too low nor too high, and high compressive strength. The objective of this study was to investigate the influence of the powder particle distribution on various properties of one acrylic bone cement; namely, residual monomer content, Tmax, tset, complex viscosity, storage and loss moduli, injectability, and quasi-static compressive strength and modulus. It was found that the formulations that possessed the most suitable complex viscosity-versus-mixing time characteristics are those in which the ratio of the large poly(methyl methacrylate) beads (of mean diameter 118.4 ,m) to the small ones (of mean diameter 69.7 ,m) was at least 90% w/w. For these formulations, the values of the other properties determined were acceptable. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006 [source] Chemically Bonded Phosphate Ceramics: II, Warm-Temperature Process for Alumina CeramicsJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 11 2003Arun S. Wagh This is the second of three papers on a dissolution model that describes the formation of chemically bonded phosphate ceramics. In this paper, we discuss the kinetics of formation of aluminum phosphate ceramics between 100° and 150°C. Using basic thermodynamic formulations, we calculated the temperatures of maximum solubility of alumina and its hydrated phases and predicted the temperatures of formation of ceramics. Differential thermal and X-ray diffraction analyses on samples made in the laboratory confirm these temperatures. The resulting ceramics of alumina bonded with aluminum phosphate (berlinite) show a high compressive strength of 16 000 psi. We have concluded that rapid evaporation of excess water in the slurry generates porosity in the ceramics, and that better processing methods are needed. A consolidation model is presented that describes the microstructure of the ceramic. It predicts that a very small amount of alumina must be converted to form the bonding phase; hence, the product is mostly alumina with a thin coating of berlinite on the surface of alumina particles. [source] A novel silicate-doped calcium-based composite dental pulp capping agentASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 5 2009Fangping Chen Abstract The development of a dental pulp capping agent (DPCA) requires suitable setting time, acceptable compressive strength, favorable bioactivity, and to facilitate cementum tissue regeneration. Calcium phosphate cement (CPC) is widely used for its self-setting, biodegradability, biocompatibility, and formability. However, a relative low strength and lack of bioactivity have limited its application. Herein, dicalcium silicate (Ca2SiO4, C2S) was introduced into CPC to prepare a novel silicate-doped CPC/C2S composite DPCA by self-setting in situ and its setting time, compressive strength, bioactivity, and biomineralization behaviors were investigated. The results indicated that the mechanical strength and setting time of DPCA were higher than those of pure CPC. C2S transformed into a CSH gel without disturbing the hydration of DPCA after soaking in SBF for 5 days. Moreover, much more bone-like hydroxyapatite layers were formed, and DPCA exhibited higher bioactivity mainly in virtue of the rapid formation of CSH. DPCA with 15 wt% C2S, suggested to be the optimized composite, exhibited significantly improved bioactivity and high compressive strength, indicating that DPCA with 15 wt % C2S might have a significant pulp capping therapy advantage over the pure CPC. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd. [source] Macroporous Ceramics from Particle-Stabilized Wet FoamsJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 1 2007Urs T. Gonzenbach We present a novel direct-foaming method to produce macroporous ceramics using particles instead of surfactants as stabilizers of the wet foams. This method allows for the fabrication of ultra-stable wet foams that resist coarsening upon drying and sintering. Macroporous ceramics of various chemical compositions with open or closed cells, average cell sizes ranging from 10 to 300 ,m and porosities within 45% and 95%, can be easily prepared using this new approach. The sintered foams show high compressive strengths of up to 16 MPa in alumina foams with porosities of 88%. [source] | ||||||||||