Prediction of overall shape of sintered alumina compacts

1994-01-01
The effects of the final aspect ratio on the overall shape of cylindrical sintered compacts, prepared by a uniaxial die pressing technique, are measured and described. An empirical compaction equation, which describes the compaction behaviour of a spray dried AKP-30 alumina powder, is presented The density distribution along the axis of the compacts was predicted by, using an established first-order analysis. From these predicted density distributions, the overall shapes of the sintered compacts were quite accurately predicted by using a set of sintering simulation equations obtained in separate experiments.
Journal of the European Ceramic Society

Suggestions

Simulation of equal channel angular pressing applied to produce structures with ultrafine-sized grains
Karpuz, Pinar; Şimşir, Caner; Gür, Cemil Hakan (Inderscience Publishers, 2009-01-01)
Severe plastic deformation methods are of great interest in industrial forming applications, as they give rise to significant refinement in microstructures and improvements in mechanical and physical properties. In the 'equal channel angular pressing (ECAP)', which is the most common method for production of ultrafine grained bulk samples, very high plastic strains are introduced into the bulk material without any change in cross section. In this study, the plastic deformation behaviour of the materials sub...
Improvement in sinterability and phase stability of hydroxyapatite and partially stabilized zirconia composites
Evis, Zafer; KUTBAY, IŞIL (Elsevier BV, 2009-03-01)
Composites of hydroxyapatite with partially stabilized zirconia with MgO or MgF2 were pressureless sintered between 1000 degrees C and 1300 degrees C. The reactions and transformations of phases were verified by X-ray diffraction. For the hydroxyapatite and zirconia composites with MgO, calcium from the hydroxyapatite diffused into the zirconia phase, and the hydroxyapatite decomposed to tri-calcium phosphate at sintering temperatures higher than 1000 degrees C. Above about 1200 degrees C, CaZrO3 was formed...
Computation of Thermal Fracture Parameters for Inclined Cracks in Functionally Graded Materials Using Jk-Integral
Dağ, Serkan (Informa UK Limited, 2009-01-01)
This article describes the formulation and implementation of the Jk-integral for the analysis of inclined cracks located in functionally graded materials (FGMs) that are subjected to thermal stresses. The generalized definition of the Jk-integral over a vanishingly small curve at the tip of an inclined crack is converted to a domain independent form that consists of area and line integrals defined over finite domains. A numerical procedure based on the finite element method is then developed, which allows t...
Ambient synthesis of nanomaterials by in situ heterogeneous metal/ligand reactions
Chang, Boyce S.; Thomas, Brijith; Chen, Jiahao; Tevis, Ian D.; Karanja, Paul; Çınar, Simge; Venkatesh, Amrit; Rossini, Aaron J.; Thuo, Martin M. (Royal Society of Chemistry (RSC), 2019-08-07)
Coordination polymers are ideal synthons in creating high aspect ratio nanostructures, however, conventional synthetic methods are often restricted to batch-wise and costly processes. Herein, we demonstrate a non-traditional, frugal approach to synthesize 1D coordination polymers by in situ etching of zerovalent metal particle precursors. This procedure is denoted as the heterogeneous metal/ligand reaction and was demonstrated on Group 13 metals as a proof of concept. Simple carboxylic acids supply the etch...
Development of computational software for analysis of curved girders under construction loads
Topkaya, Cem (Elsevier BV, 2003-09-01)
The analysis of horizontally curved, trapezoidal steel girders presents a variety of computational challenges. During the erection and construction stages before a concrete deck is available to form a closed section, these girders are weak in torsion and susceptible to warping. Considering the design of an entire bridge system, current design approaches favor the use of a grid analysis methodology. While the use of a grid analysis procedure offers the advantage of computational efficiency, it is unable to c...
Citation Formats
N. Özkan, “Prediction of overall shape of sintered alumina compacts,” Journal of the European Ceramic Society, pp. 143–151, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30592.