scholarly journals Novel fast firing method to synthesize tetracalcium phosphate

2021 ◽  
Author(s):  
Muhammad S. Nizar ◽  
Naili Sofiyaningsih ◽  
Ria J. Manullang ◽  
Rizky B. Wijayanti ◽  
Irna Rosmayanti ◽  
...  
Keyword(s):  
Tetracalcium Phosphate ◽  
Firing Method ◽  
Fast Firing

scholarly journals Tetracalcium Phosphate/Monetite/Calcium Sulfate Hemihdrate Biocement Powder Mixtures Prepared by the One-Step Synthesis for Preparation of Nanocrystalline Hydroxyapatite Biocement-Properties and In Vitro Evaluation

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2137
Author(s):  
Lubomir Medvecky ◽  
Maria Giretova ◽  
Radoslava Stulajterova ◽  
Lenka Luptakova ◽  
Tibor Sopcak
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Calcium Sulfate ◽  
Powder Mixtures ◽  
Liquid Component ◽  
Tetracalcium Phosphate ◽  
Nanocrystalline Hydroxyapatite ◽  
One Step ◽  
Calcium Sulfate Hemihydrate

A modified one-step process was used to prepare tetracalcium phosphate/monetite/calcium sulfate hemihydrate powder cement mixtures (CAS). The procedure allowed the formation of monetite and calcium sulfate hemihydrate (CSH) in the form of nanoparticles. It was hypothesized that the presence of nanoCSH in small amounts enhances the in vitro bioactivity of CAS cement in relation to osteogenic gene markers in mesenchymal stem cells (MSCs). The CAS powder mixtures with 15 and 5 wt.% CSH were prepared by milling powder tetracalcium phosphate in an ethanolic solution of both orthophosphoric and sulfuric acids. The CAS cements had short setting times (around 5 min). The fast setting of the cement samples after the addition of the liquid component (water solution of NaH2PO4) was due to the partial formation of calcium sulfate dihydrate and hydroxyapatite before soaking in SBF with a small change in the original phase composition in cement powder samples after milling. Nanocrystalline hydroxyapatite biocement was produced by soaking of cement samples after setting in simulated body fluid (SBF). The fast release of calcium ions from CAS5 cement, as well as a small rise in the pH of SBF during soaking, were demonstrated. After soaking in SBF for 7 days, the final product of the cement transformation was nanocrystalline hydroxyapatite. The compressive strength of the cement samples (up to 30 MPa) after soaking in simulated body fluid (SBF) was comparable to that of bone. Real time polymerase chain reaction (RT-PCR) analysis revealed statistically significant higher gene expressions of alkaline phosphatase (ALP), osteonectin (ON) and osteopontin (OP) in cells cultured for 14 days in CAS5 extract compared to CSH-free cement. The addition of a small amount of nanoCSH (5 wt.%) to the tetracalcium phosphate (TTCP)/monetite cement mixture significantly promoted the over expression of osteogenic markers in MSCs. The prepared CAS powder mixture with its enhanced bioactivity can be used for bone defect treatment and has good potential for bone healing.

Process and material parameters towards the design of fast firing cycles for high permeability MnZn ferrites

2014 ◽  
Vol 588 ◽  
pp. 222-227 ◽  
Author(s):  
V. Tsakaloudi ◽  
G. Kogias ◽  
V.T. Zaspalis
Keyword(s):  
High Permeability ◽  
Material Parameters ◽  
Mnzn Ferrites ◽  
Fast Firing

The Structure of the Column in Stylidium

1989 ◽  
Vol 37 (1) ◽  
pp. 81 ◽  
Author(s):  
N Findlay ◽  
GP Findlay
Keyword(s):  
Internal Structure ◽  
Small Groups ◽  
Central Layer ◽  
Wide Range ◽  
Single Column ◽  
Cellulose Fibrils ◽  
Shape And Size ◽  
Fast Firing

In the genus Stylidium, the style and filaments of the flower are fused into a single column. In most species the column, when stimulated mechanically, undergoes a fast firing movement followed by a slow resetting movement. This movement is produced by changes in shape of a normally curved region of the column, the bend. In a wide range of species, the bend has a specialised anatomy and consists essentially of a longitudinal central layer of cells with two distinctive multi-celled layers of thick-walled cells on either side. The thick-walled cells are rich in cytoplasm with amyloplasts and vacuoles of varying sizes, and have non-lignified walls whose cellulose fibrils are arranged approximately transversely. Within the bend, the phloem occurs as discrete small groups of cells separated by some distance from the xylem. In species from the subgenus Centridium both the morphology and the internal structure of the bend differ somewhat from those in most species of Stylidium, and in two species of Stylidium with nonmoving columns, the characteristic cellular anatomy of the bend is entirely absent. The specialised anatomy of the cells and tissues in the bend are clearly associated with the movement of the column. Changes of shape and size of these cells are almost certainly responsible for the change in shape of the bend.

Effect of Green Microstructure and Processing Variables on the Microwave Sintering of Alumina

1990 ◽  
Vol 189 ◽  
Author(s):  
Arindam Dé ◽  
Iftikhar Ahmad ◽  
E. Dow Whitney ◽  
David E. Clark
Keyword(s):  
Particle Size ◽  
Microwave Sintering ◽  
Heating Rates ◽  
Hybrid Heating ◽  
Processing Variables ◽  
Conventional Sintering ◽  
Rapid Sintering ◽  
Temperature Time ◽  
Fast Firing

ABSTRACTThe concept of 'hybrid heating with microwave (MW) energy at 2.45 GHZ.'for ultra rapid sintering of alumina is being introduced. This technique is a combination of MW - materual interaction as well as conventional radiant/conduction mechanisms, and facilitates the attainment of perhaps, the highest possible heating rates in a multimode MW cavity at 2.45 GJZz. (1500ºC in 120 sees.). Rapid sintering of pure.undoped alumina with this novel techniQue culminates in uniform, homogeneous microstructures and mechanical property enhancements vis-a-vis conventional fast firing.The role of green microstructure (particle size) on MW(hybrid) heating and processing variables (temperature, time) on the MW (hybrid) heating phenomena vs. conventional fast firing were investigated. Hybrid heated samples showed accelerated densification with comparable grain sizes when compared with the conventionally fast fired samples. The effectof particle size on the microwave (hybrid) heating phenomena was found to be analogous to conventional sintering.

Porcelain for fast firing

1977 ◽  
Vol 3 (2) ◽  
pp. 65-69 ◽  
Author(s):  
H. Moertel
Keyword(s):  
Fast Firing

Osteogenic potential and properties of injectable silk fibroin/tetracalcium phosphate/monetite composite powder biocement systems

2021 ◽  
Author(s):  
Lubomir Medvecky ◽  
Maria Giretova ◽  
Radoslava Stulajterova ◽  
Lenka Luptakova ◽  
Tibor Sopcak ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Composite Powder ◽  
Osteogenic Potential ◽  
Tetracalcium Phosphate

scholarly journals Densificação rápida de cerâmicas de SnO2

Cerâmica ◽  
2003 ◽  
Vol 49 (310) ◽  
pp. 116-119 ◽  
Author(s):  
G. J. Pereira ◽  
D. Gouvêa
Keyword(s):  
Fast Firing

Os pós à base de óxido de estanho são conhecidos por apresentarem baixa densificação mesmo a temperaturas de sinterização acima de 1500 °C. A introdução de diferentes íons metálicos como Mn2+, Fe3+ e Cu2+ induzem a redução do volume de poros e crescimento de grãos durante a sinterização. Pós à base de SnO2 foram preparados pela rota química derivada da patente de Pechini, contendo diferentes concentrações de Mg2+ ou Fe3+. Todas as amostras apresentaram uma alta taxa de densificação nos momentos iniciais, quando sinterizadas por "fast firing". As amostras contendo 5% em mol de ferro sinterizadas durante 30 s a 1200 °C apresentaram densidades superiores às amostras sinterizadas por aquecimento em taxas normais (10 °C/min) por 4 h a 1200 °C. O fenômeno de eliminação rápida de poros pode ser explicado, levando em conta o papel da superfície no fenômeno de sinterização. A saturação da superfície pelo aditivo foi confirmada por medidas de mobilidade eletroforética dinâmica com base na literatura e em dados experimentais.

Comparative radiopacity of tetracalcium phosphate and other root-end filling materials

2000 ◽  
Vol 33 (4) ◽  
pp. 311-315 ◽  
Author(s):  
C. D. Laghios ◽  
B. W. Benson ◽  
J. L. Gutmann ◽  
C. W. Cutler
Keyword(s):  
Tetracalcium Phosphate ◽  
Filling Materials

Bioresorption behavior of tetracalcium phosphate-derived calcium phosphate cement implanted in femur of rabbits

Biomaterials ◽  
2008 ◽  
Vol 29 (8) ◽  
pp. 984-993 ◽  
Author(s):  
Chih-Hung Tsai ◽  
Ruey-Mo Lin ◽  
Chien-Ping Ju ◽  
Jiin-Huey Chern Lin
Keyword(s):  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
Tetracalcium Phosphate

scholarly journals Processing of porcelain stoneware tile using sugarcane bagasse ash waste

2015 ◽  
Vol 9 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Myrian Schettino ◽  
José Holanda
Keyword(s):  
Sugarcane Bagasse ◽  
Low Cost ◽  
Linear Shrinkage ◽  
Raw Material ◽  
Partial Replacement ◽  
Firing Cycle ◽  
Sintering Process ◽  
Natural Quartz ◽  
Sugarcane Bagasse Ash ◽  
Fast Firing

Large amounts of waste materials are discarded in the sugarcane industry. This work investigates the reuse of sugarcane bagasse ash waste as an alternative raw material for porcelain stoneware tile bodies, replacing natural quartz by up to 5 wt.%. The tile pieces were fired at 1230 ?C using a fast-firing cycle (< 60min). The technological properties of the fired tile pieces (e.g., linear shrinkage, water absorption, apparent density, and flexural strength) were determined. The sintering process was followed by SEM and XRD analyses. The results show that up to 2.5 wt.% sugarcane bagasse ash waste can be used as a partial replacement for quartz in porcelain stoneware tile (group BIa, ISO 13006 standard), providing excellent technical properties. Hence, its application in high-quality ceramic tile for use in civil construction as a low-cost, alternative raw material could be an ideal means of managing sugarcane bagasse ash waste.

Sign in / Sign up

Export Citation Format

Share Document