Properties Of Advanced Ceramics Research Articles

The importance of reinforcing advanced ceramics in space projects

This article addresses the role of advanced ceramics in space exploration, highlighting their importance in tackling the unique challenges of the extraterrestrial environment. Starting with an analysis of the Space Shuttle Columbia disaster in 2003, lessons learned and safety measures implemented in the aftermath of the incident are discussed. The properties of advanced ceramics, including resistance to extreme temperatures, chemical stability, and thermal insulation capability, are explored, along with their applicability in space missions, such as radiation protection, resistance to debris, and propulsion. Strategies for maximizing the resilience of ceramics in space environments are examined, including advanced manufacturing techniques and continuous monitoring systems. Finally, specific applications of ceramics in space components, such as rocket nozzles, propulsion systems, and heat-to-electricity conversion, are discussed, emphasizing the ongoing need for innovation to ensure the success of future space missions.

Physical properties of slip casting of high pure Al2O3 slurry using porous Al2O3-glass mold

Physical properties of advanced ceramics are influenced by impurities produced in the forming process. The forming compacts produced by slip casting using gypsum molds contain calcium and sulfur in green bodies. Therefore, a porous Al2O3-glass mold was produced and slip casting was performed in the present study. Porous Al2O3 ceramics as casting molds were examined in comparison with gypsum mold from viewpoints of free energy for wettability and rate of filter cake buildup. The sintered compact of Al2O3 produced by slip casting using the porous Al2O3-glass mold was compared with those using the gypsum mold. Transmittance of the sintered Al2O3 compacts using the porous Al2O3-glass molds was increased in comparison with that using the gypsum mold.

A full-field procedure for evaluating the elastic properties of advanced ceramics

In the present paper, a procedure is described whereby the elastic properties of a ceramic material are evaluated during a biaxial flexure test. The disk specimen is supported on three points and loaded by a uniform pressure on the opposite face. The whole displacement field undergone by the upper face, measured by a digital speckle interferometer, is approximated by a set of polynomials whose weights depend on the elastic properties. This dependence, previously determined by finite element analysis, is exploited to derive the values of the elastic properties from the displacement field experimentally detected. The procedure proposed was applied to a silicon carbide specimen.

Slip Casting of Alumina Using Porous Alumina Mold

Physical properties of advanced ceramics are influenced by defects produced in the forming process, and large defects can not be removed even by hot isostatic pressing process. The slip casting, which has been used in the forming process of traditional ceramics, enables one to make large and dense green bodies with complicated shapes. Wear and dissolution of gypsum molds contaminates the green bodies with calcium and sulfur. Porous alumina ceramics as casting molds were examined in comparson with gypsum from view points of wettability with water and rate of filter cake buildup. Porous alumina ceramics produced by a firing showed very high wettability values as compared with those for gypsum. Therefore, porous alumina ceramic mold with small pores provided larger penetration pressure and higher rate of filter cake buildup than gypsum mold.