Microwave sintering of fine grained HAP and HAP/TCP bioceramics

Veljović, Djordje; Zālīte, Ilmārs; Palcevskis, E.; Smiciklas, I.; Petrović, Rada; Janaćković, Dj.

doi:10.1016/j.ceramint.2009.09.038

Cited by 80 publications

(41 citation statements)

References 31 publications

(39 reference statements)

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“…This leads to finer microstructures, higher thermal stability and subsequently better mechanical properties of calcium orthophosphate bioceramics. Microwave [108,[275][276][277][278][279][280][281][282][283] and spark plasma [284][285][286][287][288][289][290][291][292] sintering techniques are alternative methods to the conventional sintering, hot pressing and hot isostatic pressing. Both alternative methods were found to be time and energy efficient densification techniques.…”

Section: Sintering and Firingmentioning

confidence: 99%

Medical Application of Calcium Orthophosphate Bioceramics

Dorozhkin¹

2011

BIO

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In the late 1960's, a strong interest was raised in biomedical applications of ceramic materials (named bioceramics a little bit later). Bioceramics was initially used as reasonable alternatives to metals in order to increase their biocompatibility. However, within a short period, it has grown into a diverse class of biomaterials, presently including three essential types: relatively bioinert, bioactive (or surface reactive) and bioresorbable bioceramics. This review is limited to bioceramics prepared from calcium orthophosphates only, which belong to the categories of bioactive and bioresorbable compounds. There have been a number of important advances in this field during the past 30 -40 years. The research was shifted from an initial study on the develop-ment of bioinert bioceramics towards bioactive and bioresorbable bioceramics, and these different types of calcium orthophosphate bioceramics can be tuned through the structural and compositional control. At the turn of the millennium, a new concept of calcium orthophosphate bioceramics has been developed to promote a regeneration of bones. Current biomedical applications of calcium orthophosphate bioceramics include artificial replacements for hips, knees, teeth, tendons and ligaments, as well as repair for periodontal disease, maxillofacial reconstruction, augmenttation and stabilization of the jawbone, spinal fusion and bone fillers after tumor surgery. Potential future applications of calcium orthophosphate bioceramics are demonstrated in drug delivery systems, effective carriers of growth factors, bioactive peptides and/or various types of cells for tissue engineering purposes.

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Section: Sintering and Firingmentioning

confidence: 99%

Medical Application of Calcium Orthophosphate Bioceramics

Dorozhkin¹

2011

BIO

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“…A different degree of phase transformation, expansion due to the formation of the new phase, and the amount of TCP in the final ceramics could be the main reasons for the different density of processed bioceramics, despite similar values of linear shrinkage [25,42]. Figures 3 and 4 show that the amounts of newly formed b-TCP phase were definitely higher in the case of the Mn-doped bioceramics, especially in the case of CSSS, and this was the main reason for the lower density of the Mn-doped CSSS samples ( Table 2).…”

Section: Resultsmentioning

confidence: 95%

“…High temperatures of conventional sintering often result in extreme grain coarsening, which further results in breakable biceramic materials. Microwave heating is a fast sintering process in which the energy can be addressed volumetrically throughout the material [25][26][27]. Volumetric heating via microwave radiation ensures uniform heating and almost no thermal gradient, which allows higher heating rates, reduces the processing time and enables limited of grain growth and unified linear and volumetric shrinkage.…”

Section: Introductionmentioning

confidence: 99%

The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics

et al. 2014

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The aims of this study were to investigate the effects of Sr-and Mn-doped ions on the sintering behaviors, microstructure and mechanical properties of the bioceramics processed by single-and two-step microwave sintering (MWSSS and MWTSS). Nano-sized calcium hydroxyapatite powders doped with Sr and Mn ions, obtained by modified precipitation synthesis, were isostatically pressed at 400 MPa and processed by MWSSS and MWTSS at different temperatures. In all cases during the sintering, the doped HAP powders turned into biphasic mixtures of HAP and TCP, but the amount of TCP was certainly lower in the case of MWTSS. It was shown that the doped ions significantly affected: density, microstructure, grain size, porosity, hardness, and fracture toughness of the processed bioceramics. Two-step microwave sintering was successfully applied for the processing of HAP/ TCP bioceramics doped with strontium and manganese ions. Both two-step microwave sintered doped bioceramics had similar and high hardness values, but the strontiumsubstituted bioceramic material certainly had higher fracture toughness (1.54 MPam 1/2 ), with an average grain size of 195 nm. Based on the results presented in this paper, it was concluded that the two-step microwave sintered strontium-doped bioceramics could be suitable materials in the bone regenerative field.

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“…Hydroxyapatite ceramics with tailored mechanical properties have also been fabricated by this technique (Rodriguez-Lorenzo et al, 2003). Further it has been shown that HA samples microwave sintered showed better densification, higher density and certainly higher hardness and fracture toughness than samples conventionally sintered at the same temperature (Veljovic et al, 2010). The addition of ZrO 2 , however, can reduce the sinterability of the composite and therefore does not reach a high density.…”

Section: Microwave Sintering Developmentsmentioning

confidence: 99%

New Challenges in the Sintering of HA/ZrO2 Composites

Vasconcelos¹

2012

Sintering of Ceramics - New Emerging Techniques

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Microwave sintering of fine grained HAP and HAP/TCP bioceramics

Cited by 80 publications

References 31 publications

Medical Application of Calcium Orthophosphate Bioceramics

Medical Application of Calcium Orthophosphate Bioceramics

The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics

New Challenges in the Sintering of HA/ZrO2 Composites

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