Near-net-shape forming of alumina powder under hot pressing and hot isostatic pressing

Kim, K.T.; Kwon, Young Soo; Kim, H.G.

doi:10.1016/s0020-7403(97)00003-9

Cited by 12 publications

(2 citation statements)

References 10 publications

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“…The simulation of the densification kinetic behavior of Astroloy powders during HIP process has been reported by Jinka [13]. Kim et al have simulated the deformation of alumina powder during HIP process [14]. A new FEA model for HIP has been implemented as reported by Jeon et al [15].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental investigation on densification, shape deformation, and stress distribution of Ti6Al4V compacts during hot isostatic pressing

Zhou

Song

Xue

et al. 2016

Int J Adv Manuf Technol

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Hot isostatic pressing of metal powders involves a complex thermal and mechanical coupling process. A constitutive model based on Perzyna's elastic-viscoplasticity equation was proposed, and a Lagrangian finite element method was applied to analyze the large deformation, nonlinear friction, powder flow, and densification behavior during hot isostatic pressing. The mechanical behavior of the powders was analyzed in terms of stress distribution. For comparison to the simulation results, the density, shape deformation, and residual stress of the specimens were evaluated using Archimedes' principle, 3D measuring technology, and Empyrean X-ray diffractometer.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental investigation on densification, shape deformation, and stress distribution of Ti6Al4V compacts during hot isostatic pressing

Zhou

Song

Xue

et al. 2016

Int J Adv Manuf Technol

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“…Therefore, to lower the sintering temperature, the development of a vermicular structure must be prevented and some strategies have already been proposed in the literature to reduce the crystallization temperature and enhance the densification, such as the application of high compaction pressure, 12,13 high‐energy milling of primary particles, 11,14,15 or a combination of high‐temperature sintering with hot forging 16,17 …”

Section: Introductionmentioning

confidence: 99%

Effect of Heating Rate on Phase and Microstructural Evolution During Pressureless Sintering of a Nanostructured Transition Alumina

Palmero

Lombardi

Montanaro

et al. 2009

Int J Applied Ceramic Tech

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Deagglomeration of a nanocrystalline transition alumina performed using different techniques was first demonstrated to be active in the achievement of a better powder compaction ability under uniaxial pressing and consequently in the development of a highly dense and homogeneous microstructure during pressureless sintering. A major effect, however, was associated to the heating rate chosen during the densification cycle. In fact, the influence of different heating rates (101C/min or 11C/min) on phase and microstructural evolution during sintering was investigated in depth on the above best green bodies. A low-rate thermal cycle leads to a significant reduction of the a-Al 2 O 3 crystallization temperature and promotes a more effective particle rearrangement during phase transformation. As a consequence, in the low-rate treated material, it was possible to avoid the development of a vermicular structure as usually expected during the densification of a transition alumina and to yield a more homogenously fired microstructure.

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Fundamental aspects of hot isostatic pressing: An overview

Atkinson

Davies

2000

Metall Mater Trans A

613

268

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Hot isostatic pressing (hipping) can be used for upgrading castings, densifying presintered components, consolidating powders, and interfacial bonding. It involves the simultaneous application of a high pressure and elevated temperature in a specially constructed vessel. The pressure is applied with a gas (usually inert) and, so, is isostatic. Under these conditions of heat and pressure, internal pores or defects within a solid body collapse and diffusion bond. Encapsulated powder and sintered components alike are densified to give improved mechanical properties and a reduction in the scatter band of properties.In this article, the basic science of sintering and hipping is summarized and contrasted. The current state of understanding and modeling of hipping is then reviewed. Models can be classified either as microscopic or macroscopic in their approach. In the microscopic approach, the various mechanisms of densification are analyzed in terms of a single particle and its surroundings. In the macroscopic approach, the compact is treated as a continuous medium. In hipping, although the pressure is isostatic, shrinkage is not generally isotropic, particularly if containment is used. However, the shrinkage can now be well predicted, provided that the material and container properties are accurately known.

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Near-net-shape forming of alumina powder under hot pressing and hot isostatic pressing

Cited by 12 publications

References 10 publications

Numerical simulation and experimental investigation on densification, shape deformation, and stress distribution of Ti6Al4V compacts during hot isostatic pressing

Numerical simulation and experimental investigation on densification, shape deformation, and stress distribution of Ti6Al4V compacts during hot isostatic pressing

Effect of Heating Rate on Phase and Microstructural Evolution During Pressureless Sintering of a Nanostructured Transition Alumina

Fundamental aspects of hot isostatic pressing: An overview

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