The effect of calcination temperature on the behaviour of HA powder for injection moulding

Juang, Horng-Yih; Hon, Min–Hsiung

doi:10.1016/s0272-8842(96)00020-x

Cited by 10 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This difference stems from the lower density (82%-92%) values of the sintered product and is also attributable to the relatively coarser initial grain sizes of the precursor powder, resulting from the high temperatures of solid-state reaction. However, these strength values are extremely promising in comparison with the widely scattered and lower values obtained by Wang and Chaki (14 -15 MPa), 29 Juang and Hon (25-40 MPa), 30 and Puajindanetr et al . 31 The SEM image in Fig.…”

Section: (7) Mechanical and Microstructural Characterization Of Slip-mentioning

confidence: 52%

“…11(b)-(d), correlates very well with those obtained for the uniaxially pressed and sintered HA 28 and with those presented by other workers. 13,16,30,[32][33][34][35][36][37] Figures 11(b) and (c) show the intergranular microporosities (1-2 m) uniformly distributed throughout the body and a uniform grain-size distribution of 3-8 m. Coalescence of the grains results in densification, as observed in Figs. 11(c) and (d), and the fracture phenomena observed are both intragranular and intergranular.…”

Section: (7) Mechanical and Microstructural Characterization Of Slip-mentioning

confidence: 97%

See 1 more Smart Citation

Dispersion and Slip Casting of Hydroxyapatite

Rao

Kannan

2001

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The dispersibility in deionized water of hydroxyapatite (HA) synthesized by a high-temperature (1000°C) solid-state reaction between tricalcium phosphate and calcium hydroxide was investigated as a function of the pH of the medium and the quantity of two dispersing agents (A ‫؍‬ inorganic, B ‫؍‬ organic) added to the slips. Although pH modification had a negligible effect on dispersibility, both of the dispersing agents produced a good dispersion at considerably higher concentrations (>2 wt% of HA). At optimum amounts (2-4 wt%) of the dispersing agents, the slips showed near-Newtonian flow behavior up to 45 wt% solids loading and non-Newtonian behavior at >50 wt%. By the optimal addition of dispersing agents and conditioning by ball milling, 60 -67 wt% (32-39 vol%) solids-loaded HA slips could be cast into plaster molds to produce 50%-58% dense green bodies, which, in turn, sintered to 90%-94% density in the temperature range 1300°-1400°C. The sintered HA exhibited a three-point flexural strength of 40 -60 MPa and a homogeneous microstructure, with interspersed microporosities.

show abstract

Section: (7) Mechanical and Microstructural Characterization Of Slip-mentioning

confidence: 52%

Section: (7) Mechanical and Microstructural Characterization Of Slip-mentioning

confidence: 97%

Dispersion and Slip Casting of Hydroxyapatite

Rao

Kannan

2001

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…9 These agglomerates are thought * Author for correspondence (ahmedymz@hotmail.com) to be 'soft agglomerate' formed by Vander Waals force and it can be easily disintegrated by mixing. 10 Such agglomerates are known to be difficult to be dispersed owing to their surface charge state 11 and the producing of very small particles upon mixing. On the other hand, powders with the extremely low surface area have higher density and grain size could be settled out resulting in density heterogeneity in the green body.…”

Section: Introductionmentioning

confidence: 99%

Changes in hydroxyapatite powder properties via heat treatment

2015

View full text Add to dashboard Cite

The properties of hydroxyaptite (HA) powder, especially its physical one, are largely influenced by the heat treatment process. Controlling of these changes is vital in deciding the suitability of applying this powder in wet processing routes for green body fabrication. Chemically, the crystallinity of the HA powder was found to be largely enhanced with the increase in calcination temperatures. In contrary, a high retardation in the carbonate ion content was found. Physically, all the powder properties in terms of particle size, its distribution, pore volume, pore size and surface area are considerably varied with calcination temperatures. It was found that HA powder calcined at both 1000 and 1100 • C possesses reasonable physico-chemical properties for being applied in wet processing routes. Using heat-treated powder at 1000 and 1100 • C with 0.3 wt% sodium polyacrylate (as a dispersing agent) turned out to be beneficial in developing a low viscosity and high turbidity suspensions.

show abstract

“…It has been now widely recognized that the injection molding is advantageous for industrial scale production of net shaped ceramic and metal products of complex shapes. The major steps involved in injection molding process are powder mixing, molding, debinding, and sintering 19, 20. Although not very popular among researchers, injection molding has been used in the past to shape biomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…Bakar et al23 reported mechanical properties of HAp‐PEEK composites, produced by injection molding. Juang and Hon20 prepared HAp ceramic bars by injection molding in an effort to study the effect of calcination temperature on the HAp powder and injection molding processability. Sahebian et al investigated the influence of nanosized CaCO 3 addition on the toughness properties of HDPE nanocomposites, fabricated using injection molding 24…”

Section: Introductionmentioning

confidence: 99%

Processing, tensile, and fracture properties of injection molded Hdpe‐Al₂O₃‐HAp hybrid composites

Basu

Jain

Kumar

et al. 2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

The aim of this study is to characterize the physical and mechanical properties of HDPE-aluminaHAp composites prepared by injection molding techniques and to demonstrate their superiority over unreinforced HDPE. Composites with up to 30 vol. % of filler, composed of equal volumes of HAp and alumina, were successfully processed by injection molding. On the basis of the analysis of processing results, i.e., melt viscosity, volume flow rate, shear rate, mixing torque, the critical ceramic loading was determined. Tensile tests done at varying crosshead speeds confirm that an increase in ceramic loading results in an increase in strength, as well as a simultaneous decrease in the total elongation at failure. A maximum strength of 20 MPa and a maximum tensile modulus of around 1 GPa was achieved with 30 vol % ceramic loading in semicrystalline HDPE matrix. SEVNB test results demonstrate an improvement in toughness at 20 vol %. The fracture properties are discussed in terms of interfacial bonding between ceramic fillers and the semicrystalline HDPE matrix.

show abstract

The effect of calcination temperature on the behaviour of HA powder for injection moulding

Cited by 10 publications

References 9 publications

Dispersion and Slip Casting of Hydroxyapatite

Dispersion and Slip Casting of Hydroxyapatite

Changes in hydroxyapatite powder properties via heat treatment

Processing, tensile, and fracture properties of injection molded Hdpe‐Al₂O₃‐HAp hybrid composites

Contact Info

Product

Resources

About

The effect of calcination temperature on the behaviour of HA powder for injection moulding

Cited by 10 publications

References 9 publications

Dispersion and Slip Casting of Hydroxyapatite

Dispersion and Slip Casting of Hydroxyapatite

Changes in hydroxyapatite powder properties via heat treatment

Processing, tensile, and fracture properties of injection molded Hdpe‐Al2O3‐HAp hybrid composites

Contact Info

Product

Resources

About

Processing, tensile, and fracture properties of injection molded Hdpe‐Al₂O₃‐HAp hybrid composites