A novel fabrication procedure for producing high strength hydroxyapatite ceramic scaffolds with high porosity

2021 ◽  
Author(s):  
Ade Indra ◽  
Fauzan Hadi ◽  
Ismet Hari Mulyadi ◽  
Jon Affi ◽  
Gunawarman
Keyword(s):  
High Strength ◽  
High Porosity ◽  
Hydroxyapatite Ceramic ◽  
Fabrication Procedure

scholarly journals Investigation into the Structural, Chemical and High Mechanical Reforms in B4C with Graphene Composite Material Substitution for Potential Shielding Frame Applications

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1921
Author(s):  
Ibrahim M. Alarifi
Keyword(s):  
Composite Material ◽  
Melting Point ◽  
Boron Carbide ◽  
High Strength ◽  
Stir Casting ◽  
High Fracture Toughness ◽  
Chemical Compositions ◽  
High Fracture ◽  
Fabrication Procedure ◽  
Standard Designs

In this work, boron carbide and graphene nanoparticle composite material (B4C–G) was investigated using an experimental approach. The composite material prepared with the two-step stir casting method showed significant hardness and high melting point attributes. Scanning electron microscopy (SEM), along with energy dispersive X-ray spectroscopy (EDS) analysis, indicated 83.65%, 17.32%, and 97.00% of boron carbide + 0% graphene nanoparticles chemical compositions for the C-atom, Al-atom, and B4C in the compound studied, respectively. The physical properties of all samples’ B4C–G like density and melting point were 2.4 g/cm3 density and 2450 °C, respectively, while the grain size of B4C–G was in the range of 0.8 ± 0.2 µm. XRD, FTIR, and Raman spectroscopic analysis was also performed to investigate the chemical compositions of the B4C–G composite. The molding press composite machine was a fabrication procedure that resulted in the formation of outstanding materials by utilizing the sintering process, including heating and pressing the materials. For mechanical properties, high fracture toughness and tensile strength of B4C–G composites were analyzed according to ASTM standard designs. The detailed analysis has shown that with 6% graphene content in B4C, the composite material portrays a high strength of 134 MPa and outstanding hardness properties. Based on these findings, it is suggested that the composite materials studied exhibit novel features suitable for use in the application of shielding frames.

scholarly journals Anisotropic Cellulose Nanofibers/Polyvinyl Alcohol/Graphene Aerogels Fabricated by Directional Freeze-drying as Effective Oil Adsorbents

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 712 ◽  
Author(s):  
Lijie Zhou ◽  
Shengcheng Zhai ◽  
Yiming Chen ◽  
Zhaoyang Xu
Keyword(s):  
Polyvinyl Alcohol ◽  
Freeze Drying ◽  
High Efficiency ◽  
Cellulose Nanofibers ◽  
High Strength ◽  
Dip Coating ◽  
High Porosity ◽  
Water Contact ◽  
Water Separation ◽  
Composite Aerogel

Under the current situation of frequent oil spills, the development of green and recyclable high-efficiency oil-absorbing aerogel materials has attracted wide attention from researchers. In this study, we report a high-strength, three-dimensional hydrophobic cellulose nanofiber (CNF)/polyvinyl alcohol (PVA)/graphene oxide (GO) composite aerogel with an anisotropic porous structure, which was fabricated by directional freeze-drying technology using anisotropically grown ice crystals as a template, followed by hydrophobic treatment with a simple dip coating process. The prepared composite aerogel presented anisotropic multi-level pore microstructures, low density (17.95 mg/cm3) and high porosity (98.8%), good hydrophobicity (water contact angle of 142°) and great adsorption capacity (oil absorption reaching 96 times its own weight). More importantly, the oriented aerogel had high strength, whose compressive stress at 80% strain reached 0.22 MPa and could bear more than 22,123 times its own weight without deformation. Therefore, the CNF/PVA/GO composite aerogel prepared by a simple and easy-to-operate directional freeze-drying method is a promising absorbent for oil-water separation.

scholarly journals High strength and low swelling composite hydrogels from gelatin and delignified wood

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shennan Wang ◽  
Kai Li ◽  
Qi Zhou
Keyword(s):  
Mechanical Strength ◽  
High Strength ◽  
Honeycomb Structure ◽  
Composite Hydrogel ◽  
High Porosity ◽  
High Mechanical Strength ◽  
Composite Hydrogels ◽  
Freeze Dried ◽  
Strength And Stiffness ◽  
Phosphate Buffered Saline

Abstract A delignified wood template with hydrophilic characteristics and high porosity was obtained by removal of lignin. Gelatin was infiltrated into the delignified wood and further crosslinked with a natural crosslinker genipin to form hydrogels. The composite hydrogels showed high mechanical strength under compression and low swelling in physiological condition. The effect of genipin concentrations (1, 50 and 100 mM) on structure and properties of the composite hydrogels were studied. A porous honeycomb structure with tunable pore size and porosity was observed in the freeze-dried composite hydrogels. High elastic modulus of 11.82 ± 1.51 MPa and high compressive yield stress of 689.3 ± 34.9 kPa were achieved for the composite hydrogel with a water content as high as 81%. The equilibrium water uptake of the freeze-dried hydrogel in phosphate buffered saline at 37 °C was as low as 407.5%. These enables the delignified wood structure an excellent template in composite hydrogel preparation by using infiltration and in-situ synthesis, particularly when high mechanical strength and stiffness are desired.

Fracture Analysis of Ceramic Proppants

1983 ◽  
Vol 105 (2) ◽  
pp. 128-133 ◽  
Author(s):  
S. R. Swanson ◽  
R. A. Cutler
Keyword(s):  
Hollow Spheres ◽  
High Strength ◽  
Solid Particles ◽  
Strength Analysis ◽  
Hydraulic Pressure ◽  
Interparticle Contact ◽  
High Porosity ◽  
Fluid Permeability ◽  
Deep Wells ◽  
Petroleum Wells

Small particles (traditionally sand) are mixed with fluid in hydraulic fracturing treatments of petroleum wells to stimulate production. The solid particles, called proppants, are used to prop open the fracture as hydraulic pressure is reduced. Deep wells can demand higher strength than provided by sand, while low specific gravity is desired to improve proppant transport. This paper considers the stress and strength analysis of proppants, and considers the use of high-strength ceramics as possible proppants. The stresses produced by interparticle contact are analyzed, which along with a failure criterion based on a critically stressed volume lead to a fracture prediction. The results show that ceramics can give adequate strength, even when used in low-density forms such as with high porosity or as hollow spheres. Laboratory tests of the effect of closure pressure on fluid permeability are seen to be in good agreement with the fracture predictions.

A novel approach to prepare high strength and high porosity reticulated porous ceramics by in-situ synthesis of mullite whiskers

2021 ◽  
Vol 47 (10) ◽  
pp. 14561-14568
Author(s):  
Dong Lao ◽  
Peng Lin ◽  
Xiajie Liu ◽  
Ruoyu Chen ◽  
Wenbao Jia ◽  
...  
Keyword(s):  
High Strength ◽  
Porous Ceramics ◽  
In Situ Synthesis ◽  
High Porosity ◽  
Novel Approach ◽  
Mullite Whiskers

Preparation of In Situ Synthesized SiC Particles Reinforced Highly Porous Si3N4 Ceramics by Gel-Casting

2008 ◽  
Vol 368-372 ◽  
pp. 898-900
Author(s):  
Hong Zeng ◽  
Hong Jie Wang ◽  
Juan Li Yu ◽  
Dan Bo Lin ◽  
Guan Jun Qiao ◽  
...  
Keyword(s):  
High Strength ◽  
Xrd Analysis ◽  
High Porosity ◽  
Water Displacement ◽  
Contributing Factors ◽  
Homogeneous Microstructure ◽  
Three Point Bending ◽  
Gel Casting ◽  
Sic Particles ◽  
Highly Porous

In this paper, highly porous Si3N4 ceramics with high strength, homogeneous microstructure were fabricated by introducing a proper amount of nanometer carbon in the Si3N4 slurry by gel-casting. Scanning electron microscopy, X-ray diffraction, Archimedes water-displacement method and three-point bending tests were employed to analyze the microstructures and mechanical properties of the sintered bodies. It was shown by the XRD analysis that SiC particles were formed in the sintered bodies. The pillar β- Si3N4 morphology, homogeneous microstructure and the SiC particles as a reinforcement phase are the contributing factors for high porosity and good mechanical behavior.

Formability of Porous Tantalum Sheet-Metal

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Paul S. Nebosky ◽  
Steven R. Schmid
Keyword(s):  
Chemical Vapor ◽  
Forming Limit Diagram ◽  
High Strength ◽  
Orthopedic Implants ◽  
Forming Limit ◽  
High Porosity ◽  
Porous Tantalum ◽  
Cellular Solid ◽  
The Past ◽  
Measuring Surface

Over the past 10 years, a novel cellular solid, Trabecular MetalTM (TM), has been developed for use in the orthopedics industry as an ingrowth scaffold. Manufactured using chemical vapor deposition (CVD) on top of a graphite foam substrate, this material has a regular matrix of interconnecting pores, high strength, and high porosity. Manufacturing difficulties encourage the application of stamping and forming technologies to increase CVD reactor throughput and reduce materials wastes. In this study, the formability of TM was evaluated using a novel camera-based system for measuring surface strains, since the conventional approach of printing or etching gridded patterns was not feasible. A forming limit diagram was then obtained using specially fabricated 1.65 mm thick sheets. No lubricant was used due to the cleanliness requirements for orthopedic implants.

Reaction Sintering of Tial Intermetallic Compound

2021 ◽  
Vol 1016 ◽  
pp. 744-748
Author(s):  
Yoshihiro Kohama ◽  
Masahiro Kimura ◽  
Toru Shimizu ◽  
Hisaki Watari
Keyword(s):  
Fuel Efficiency ◽  
Carbon Dioxide Emission ◽  
High Strength ◽  
High Porosity ◽  
Reaction Sintering ◽  
Low Oxygen ◽  
Mixed Powder ◽  
Rapid Temperature ◽  
Ti Powder ◽  
Low Oxygen Concentration

Improvement of fuel efficiency and reduction of carbon dioxide emission are important issues in the automotive and aviation industries. To achieve these issues, materials that are lightweight and have excellent heat resistance are required. For this reason, various alloys have been proposed. Among them, TiAl intermetallic compounds have excellent low specific gravity and high strength at high temperature. However, TiAl is difficult for machining and easily oxidized, so casting is difficult. For this reason, a method using reaction sintering has been studied, though it is difficult to obtain low oxygen concentration TiAl alloy powder. Therefore, the process to produce TiAl parts from Ti powder and Al powder is studied. However, in this method, when a mixed powder of Ti and Al is sintered, a phenomenon called ignition with a rapid temperature increasing may occurs, and ignited parts are swelling and becomes high porosity.

Low-Temperature Sintering of Porous Silicon Carbide Ceramics with H3PO4 as an Additive

2018 ◽  
Vol 281 ◽  
pp. 311-315 ◽  
Author(s):  
Tian Gu ◽  
Fei Chen ◽  
Hai Long Yuan ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Phosphoric Acid ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Strength ◽  
High Porosity ◽  
Low Temperature Sintering ◽  
Sic Ceramic ◽  
Carbide Ceramics ◽  
Porous Sic ◽  
Silicon Carbide Ceramics

In this paper, the raw SiC powder is oxidized at high temperature (1000 °C for 4h), and a layer of SiO2oxide film is formed on the surface of SiC particles. By adding phosphoric acid, phosphoric acid reacts with SiO2at lower temperatures to form phosphate. Phosphate decomposition produces gas to create pores. At 1200 °C, the phosphate is completely decomposed into SiO2, and a large amount of gas is produced to prepare porous SiC ceramic with high porosity and high strength. The effects of H3PO4content on the phase composition, microstructure, porosity and mechanical properties of the prepared porous SiC ceramic were investigated. With the increase of H3PO4content, the porosity increased and the bending strength decreased. The results suggest that at the sintering temperature of 1200 °C, the porosity of the samples can reach 58.3%~71.2%, while the bending strength of them can reach 8.72~31.09 MPa.

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