Sintering characteristics of calcium polyphosphate.

by Briana Emily Illingworth

Written in English
Published: Pages: 137 Downloads: 949
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Increasing the fibre size resulted in smaller sinter neck ratios, and increased time for initiation of crystallization. Lower humidity conditions resulted in an increase in induction time to crystallization. The presence of sodium in CPP glass yielded shorter times to crystallization. Analysis of sinter neck ratios and crystallization data indicate that the formation of sinter necks is controlled by presence of the amorphous phase, and that crystallization inhibits sinter neck growth.Calcium polyphosphate (CPP), an inorganic polymeric glass, has previously been studied for use in novel biodegradable implants as a sintered powder construct. In order to control production of sintered CPP compacts, improved understanding of sintering parameters is needed.Using a model system of aligned fibres of three sizes, the sintering characteristics of CPP were studied near its glass transition and crystallization temperatures. The effects of fibre size, relative humidity, and the presence of trace amount sodium were investigated.

The Physical Object
Pagination137 leaves.
Number of Pages137
ID Numbers
Open LibraryOL20239047M
ISBN 100494025271

Abstract: This Magnesium-doped calcium polyphosphate (MCPP) porous bioceramics of different magnesium content were prepared by the method of solid reaction sintering. The effect of magnesium on the structure and density of magnesium-doped calcium polyphosphate bioceramics was studied. Effect of glycerol concentrations on the mechanical properties of additive manufactured porous calcium polyphosphate structures for bone substitute applications. Sheydaeian E(1), Vlasea M(1), Woo A(1), Pilliar R(2)(3), Hu E(2), Toyserkani E(1). Afterward, it reviews two categories of techniques to increase the part density: material preparation techniques (powder granulation, mixing powders of different sizes, using slurry feedstock, and mixing different materials) and postprocessing techniques (sintering, . The successful synthesis of hydroxyapatite (HA), β-Tricalcium phosphate (β-TCP) and two biphasic mixtures (BCPs) of the two was performed by means of wet precipitation. The resulting crystals were characterized and the BCP composition was analyzed and identified as 13% HA—87% TCP and 41% HA—59% TCP. All samples were treated with curcumin solutions, and the degree of curcumin loading .

synthesis of amorphous calcium pyrophosphate powders and subsequent fabrication of CPP bioceramics. II. Experimental Ammonium pyrophosphate and calcium nitrate tet-rahydrate were used as received from Labteh, Russia. The ammonium pyrophosphate powder contained about 5–10 % of ammonium polyphosphate according to the quantitative XRD analysis. Biogenic Polyphosphate (Bio-PolyP) Inorganic polymeric phosphate, polyphosphate (polyP), can be chemically prepared either in a crystalline or an amorphous state [11,12]; the biogenic polyphosphate (bio-polyP) is amorphous [12,18].Similar to silica/bio-silica, synthesis of polyP requires high temperature [], while the biogenically formed bio-polyP is metabolically produced in bacteria and. On the Sintering Characteristics of Calcium Polyphosphates p Production and Characterisation of Hydroxyapatite to be Used as Coating on Prostheses via Powder Metallurgy p Cathodoluminescence Emission for Differentiating the Degree of Carbonation in Apatites p Home Key Engineering Materials Key.   The calcium polyphosphate (CPP) disks were prepared by calcining calcium phosphate monobasic monohydrate powders at °C for 10 h, melting the calcined powder at °C for 1 h, rapidly quenching in distilled/deionized water and cooling to room temperature. The resulting amorphous CPP frit was ground and sieved to.

Calcium polyphosphate is a biodegradable bone substitute. It remains a challenge to prepare porous calcium polyphosphate with desired gradient porous structures. In this study, a modified one-step. Mechanical characteristics of solid-freeform-fabricated porous calcium polyphosphate structures with oriented stacked layers ACTA BIOMATERIALIA ; 7 (4): Title: Product Design for Sensing HW at .   Get this from a library! Bioceramics: volume proceedings of the 16th International Symposium on Ceramics in Medicine, the annual meeting of the International Society for Ceramics in Medicine: bioceramics -- 16, Centro de Congressos da Alfândega do Porto, Porto, Portugal, November, [Mário A Barbosa; International Society for Ceramics in Medicine.;].

Sintering characteristics of calcium polyphosphate. by Briana Emily Illingworth Download PDF EPUB FB2

In order to understand the sintering ability and phase stability of non-stoichiometric HA, a ratio of [Ca]/[P] = work was chosen in the present study. This value is small than the stoichiometric value of but near this value.

Moreover, the properties of sintered calcium phosphate powders with [Ca]/[P] = were studied in by: On the Sintering Characteristics of Calcium Polyphosphates p Production and Characterisation of Hydroxyapatite to be Used as Coating on Prostheses via Powder MetallurgyCited by: Porous structures Sintering characteristics of calcium polyphosphate.

book formed by gravity sintering calcium polyphosphate (CPP) particles of either or microm size to form samples with vol% porosity with pore sizes in the. SODIUM CALCIUM POLYPHOSPHATE New specifications prepared at the 57th JECFA () and published in FNP 52 Add 9 (). No ADI, but a group MTDI of 70 mg/kg bw, expressed as phosphorus from all food sources, was established at the 26th JECFA ().

SYNONYMS Sodium calcium polyphosphate, glassy; INS No. (iii) DEFINITION. Effect of Potassium and Magnesium Doping on Sintering and Properties of Calcium polyphosphate Nastaran Abbarin Master of Applied Science Department of Materials Science and Engineering University of Toronto Abstract Porous constructs of calcium polyphosphate (CPP).

PubMed:Co-culture of peripheral blood-derived mesenchymal stem cells and endothelial progenitor cells on strontium-doped calcium polyphosphate scaffolds to generate vascularized engineered bone.

PubMed:The inhibitory effect of strontium-doped calcium polyphosphate particles on cytokines from macrophages and osteoblasts leading to aseptic loosening in vitro. Porous calcium polyphosphate (CPP) structures with 30 volume percent porosity and made by solid freeform fabrication (SFF) were implanted in rabbit femoral condyle sites for 6‐wk periods.

Two forms o. The effect of sintering temperature on the structure and degradability of strontium-doped calcium polyphosphate bioceramics Ceramics – Silikáty 54 (2) () 99 Strontium and calcium are in the same group on the periodic table and have similar properties.

Their atomic radii are nm and nm [21], respectively; their. Calcium Polyphosphate for BTE Scaffold. Porous calcium polyphosphate (CPP) bioceramic is an absorbable bioceramic with fine biocompatibility and degradability, and because of its special characteristics, calcium-polyphosphate-based bioceramic is considered a promising material for solving the problem associated with matching the rate of.

The first reported investigation of the use of a calcium phosphate ceramic with a similar composition to calcium polyphosphate involved the placement of fine crystalline rods of a calcium phosphate of composition 55 mol% CaO, 45 mol% P 2 O 5 in rat femurs.

Mature bone formation in direct contact with the implants was observed by 4 weeks with. Magnesium alloy (ZK61) and beta-tricalcium phosphate (β-TCP) composite ZK61/xβ-TCP (x = 0, 5, 10, 15 wt%) are fabricated using spark plasma sintering (SPS).In this study, the microstructure, mechanical properties, degradation behavior in simulated body fluid and cytotoxicity tests of composite were investigated.

Sintering is an important step in the fabrication process of ceramic bodies, which can significantly affect the microstructure and properties of materials. In this article, calcium based inorganic polyphosphate (CPP) bioceramics were synthesized by gravity sintering.

Porous calcium polyphosphate (CPP) is being investigated for use as a biodegradable bone substitute and for repair of osteochondral defects. The necessary requirements for these applications, particularly in load-bearing sites, include sufficient strength to withstand functional forces prior to bone ingrowth and substitution of the initial porous CPP template with new bone and cartilage.

Fabrication of porous calcium polyphosphate implants by solid freeform fabrication: A study of processing parameters and in vitro degradation characteristics N.

Porter Institute of Biomaterials and Biomedical Engineering, University of Toronto, ON, Toronto, Canada M5S 3E3. Calcium polyphosphate (CPP) was added to hydroxyapatite (HA) to develop a novel biphasic calcium phosphate (BCP). The effects of varying CPP dosage on the sintering property, the mechanical strength, and the phase compositions of HA were investigated.

Porous rods (6 mm in length and 4 mm in diameter) of calcium polyphosphate (CPP) made by gravity sintering of particles in the size ranges ofand microm and with initial.

In this study, copper, as one of the essential trace elements in the human body, was introduced into calcium polyphosphate (CPP) to prepare a novel scaffold in bone tissue engineering: copper-doped calcium polyphosphate (CCPP) scaffolds.

This novel scaffold was characterized by XRD, FTIR and SEM. The porosity and m. thermal hydrolysis of calcium polyphosphate during heat-treatment.

The density of the samples decreases, and the porosity increases with increasing of the content of calcium polyphosphate phase. Despite the low density, these samples demonstrated sufficient strength due to the presence of, calcium polyphosphate forming the melt during sintering.

This paper describes a comparative investigation into the in vitro solubility of the calcium polyphosphates, γ-Ca(PO3)2 and β-Ca(PO3)2. The differing arrangement of their polyphosphates chains appears to result in significant dissolution of γ-Ca(PO3)2 polymorph over the β-Ca(PO3)2 polymorph, which exhibits limited dissolution.

These properties are discussed with respect to. Calcium polyphosphate (CPP) is an inorganic polymeric bioceramic which has been increasingly studied as a bone graft.

The solution-mediated chemical degradation of strontium-substituted calcium polyphosphate (SCPP) scaffolds is well established in vitro, but an in vitro model of cell-mediated SCPP scaffold degradation has not been investigated.

The effect of porosity on the structure and properties of calcium polyphosphate bioceramics Ceramics – Silikáty 55 (1) () 45 pores network in a couple of seconds. Figure 3 reports the result of capillarity tests on CPP the fluid went up through scaffold pore network in ~s, thus further.

Composite (biphasic) mixtures of two of the most important inorganic phases of synthetic bone applications‐namely, calcium hydroxyapatite (Ca 10 (PO 4) 6 (OH) 2 (HA)) and tricalcium phosphate (Ca 3 (PO 4) 2 (TCP))‐were prepared as submicrometer‐sized, chemically homogeneous, and high‐purity ceramic powders by using a novel, one‐step chemical precipitation technique.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Sintering is an important step in the fabrication process of ceramic bodies, which can significantly affect the microstructure and properties of materials.

In this article, calcium based inorganic polyphosphate (CPP) bioceramics were synthesized by gravity sintering. Microstructure, mechanical, corrosion properties and cytotoxicity of beta‑calcium polyphosphate reinforced ZK61 magnesium alloy composite by spark plasma sintering.

Cui Z(1), Zhang Y(2), Cheng Y(3), Gong D(3), Wang W(3). Toggle navigation. Quicklinks. Search this site; Contact; Sites and opening hours; Room Reservation. Porous calcium polyphosphate (CPP) structures proposed as bone-substitute implants and made by sintering CPP powders to form bending test samples of approximately 35 vol % porosity were machined.

Abstract: We developed new calcium phosphate bone substitute material, amorphous calcium polyphosphate. The new material is synthesized by a cement-like slif-setting reaction with calcium phosphate glass, basic materials and water. In this study, we.

Morphology characteristics of calcium ferrite. According to the difference in the characteristics of calcium ferrite, they can be divided into four types of morphology, including plate-type, sheet-type, columnar-type, and acicular-type, which are shown in Fig The chemical compositions of four kinds of calcium ferrite were studied, and.

Re-evaluation of phosphoric acid–phosphates – di- tri- and polyphosphates (E –, EE –) as food additives and the safety of proposed extension of use View page or. Books. Publishing Support. Login. mechanical and corrosion properties of calcium polyphosphate reinforced ZK60A magnesium alloy composites J.

Alloys Compd. – Ramesh S et al Sintering behavior and properties. The effect of sodium doping on calcium polyphosphate Judy Wai-Tak Ue Master of Applied Science Department of Material Science & Engineering University of Toronto Abstract Calcium polyphosphate (CPP) is a suitable substrate in a novel tissue-engineering strategy.

The.The objective of this work was to evaluate the performance of calcium tripolyphosphate in anticorrosive paints. Its anticorrosive properties were studied in pigment suspensions and in solventborne paints with 10% and 30% of the pigment by volume and a pigment volume concentration/critical pigment volume concentration (PVC/CPVC) equal to The behavior of paints formulated with epoxy and.Natural calcium phosphates derived from fish wastes are a promising material for biomedical application.

However, their sintered ceramics are not fully characterized in terms of mechanical and biological properties. In this study, natural calcium phosphate was synthesized through a thermal calcination process from salmon fish bone wastes.

The salmon-derived calcium phosphates (sCaP) were.