A5027839715- Advanced ceramic materials synthesis
- Advanced materials and composites
- MXene and MAX Phase Materials
- Aluminum Alloys Composites Properties
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Boron and Carbon Nanomaterials Research
- Advanced Surface Polishing Techniques
- Synthesis and properties of polymers
- Nuclear materials and radiation effects
- Additive Manufacturing and 3D Printing Technologies
- Catalytic Processes in Materials Science
- Bone Tissue Engineering Materials
- Microwave Dielectric Ceramics Synthesis
- Thermal properties of materials
- Intermetallics and Advanced Alloy Properties
- High-Temperature Coating Behaviors
- Magnetic Properties and Synthesis of Ferrites
- Silicone and Siloxane Chemistry
- Microwave-Assisted Synthesis and Applications
- Metallic Glasses and Amorphous Alloys
- Magnesium Oxide Properties and Applications
- Radiative Heat Transfer Studies
- Ferroelectric and Piezoelectric Materials
- Chemical Synthesis and Characterization
National Institute of Advanced Industrial Science and Technology
2015-2024
Tokyo National Hospital
2024
Chukyo University
2021
Tokyo Institute of Technology
2020
Kyushu Institute of Technology
2020
Shimizu (Japan)
2020
Nagaoka University
2020
Nagaoka University of Technology
2020
Osaka University
2020
Hiroshima University
2020
Abstract Long‐term results are reported in 23 patients and short‐term 30 presenting with bone tumors treated by curettage or resection followed implantation of hydroxyapatite (HA) highly purified beta‐tricalcium phosphate (β‐TCP), respectively. Mean follow‐up was 97 26 months cases involving HA β‐TCP implantation, Radiographs revealed incorporation into host all but two cases; moreover, no obvious evidence biodegradation observed. A single patient exhibited late deformity following HA. All...
A ZrB 2 –SiC composite was prepared from a mixture of zirconium, silicon, and B 4 C via reactive hot pressing. The three‐point bending strength 506 ± 43 MPa, the fracture toughness 4.0 MPa·m 1/2 . microstructure observed scanning electron microscopy; in‐situ ‐formed SiC were found in agglomerates with size that particle‐size ranges zirconium silicon starting powders, respectively. model formation mechanism proposed, to explain features phase distributions. It is considered that, hot‐pressing...
Porous silicon carbide (SiC) ceramics were fabricated by an oxidation‐bonding process in which the powder compacts are heated air so that SiC particles bonded to each other oxidation‐derived SiO 2 glass. Because of crystallization amorphous glass into cristobalite during sintering, fracture strength oxidation‐bonded can be retained a relatively high level at elevated temperatures. It has been shown mechanical is strongly affected particle size. When 0.6 μm powders used, 185 MPa was achieved...
The maximum substitution of monovalent, divalent, and trivalent metal ions for β‐tricalcium phosphate (β‐TCP) was investigated, a model these β‐TCP proposed. Monovalent (M I ) could replace Ca(4) site vacancy ( V in as 2M =Ca 2+ + the about 9.1 mol%. In case divalent II ), Ca(5) sites were replaced by M , 13.6 Trivalent III be substituted 3M =2Ca
The microstructure and mechanical properties of silicon nitride, produced by a superplastic sinter‐forging technique, were investigated. obtained nitride exhibited highly anisotropic microstructure, where rod‐shaped grains tended to be aligned perpendicular the forging direction. A very high bending strength 2108 MPa as well fracture toughness 8.3 MPam 1/2 achieved when stress was applied perpendicularly pressing This considered due reduced flaw size process steep R ‐curve behavior caused...
High-resolution observation and elemental analysis of various particles in solution are important the fields materials, analytical chemistry, industrial applications. Analysis slurries raw materials is essential for development highly functional materials. Recently, we have developed an SEM-based scanning electron assisted dielectric microscope (SE-ADM), which can directly observe biological samples organic aqueous solutions. Here, SE-ADM system with addition energy-dispersive x-ray...
The thermal shock behavior of isotropic and anisotropic porous Si 3 N 4 was evaluated using the water‐quenching technique. critical temperature difference for crack initiation found to be strongly dependent on ratio fracture strength elastic modulus. Because a very high strain‐to‐failure, showed no macroscopic cracks able retain its even at quenching‐temperature ∼1400°C.
Mechanical properties of silicon nitride which was superplastically deformed in plane‐strain compression were investigated. Superplastically exhibited a highly anisotropic microstructure, where rod‐shaped grains tended to be aligned along the extruding direction. The bending strength and fracture toughness increased substantially by deformation process when stress applied It appears that these improvements mainly due effective operation grain bridging pull‐out alignment.
High‐strength porous alumina has been fabricated with a microstructure control using the pulse electric current sintering (PECS) technique. During discharge, which is assumed to take place in voids between particles, thought promote bridging of particles by neck growth initial stages sintering, leaving high porosity. The effect dopants (MgO, 200 ppm; TiO 2 , 1000 ppm) and secondary inclusions (3 vol% 3Y‐TZP) on constrained densification improvement mechanical behavior ceramics reported....
Porous Si 3 N 4 ceramics were synthesized by pressureless sintering of green compacts prepared using slip casting slurries containing , 5 wt% Y 2 O +2 Al and 0–60% organic whiskers composed phenol–formaldehyde resin with solids loading up to 60 wt%. Rheological properties optimized achieve a high degree dispersion solid‐volume fraction. Samples heated at 800°C in air sintered 1850°C atmosphere. Porosities ranging from 0% 45% obtained the whisker contents (corresponding 0–60 vol% whisker)....
β‐tricalcium phosphate (β‐TCP) powder doped with monovalent or divalent metal ions was hot pressed at 1100°C, and the effect of substitutional on mechanical properties β‐TCP investigated. The sinterability would be enhanced by substitution for β‐TCP. Sintered 7.6 mol% Mg 2+ ion showed a bending strength 160 MPa. It found that substituition up to 9.6 small amount is effective improve
Thermal conductive ceramic/resin composites are necessary for thermal management in order to improve the reliability of high-performance products various industrial fields. The present study created consisting silicon nitride (Si3N4) particles and epoxy resin by imbedding into matrix. Two common types Si3N4 were applied this work. α phase (α-Si3N4) β (β-Si3N4) loaded with resin. effect type on conductivity was investigated varying particle content. For below 50 vol.% Si3N4, there almost no...
Hot corrosion tests of alumina (Al2O3) and carbon silicate (SiC) ceramics exposed to KCl–NaCl molten salt were performed at high temperatures (700 800°C) for long times (100–400 h) in order improve the reliability tanks heat exchangers salts. The samples tested by being immersed under vapor. Basic data, such as product, surface conditions, 4-point bending strength acquired. In case Al2O3 ceramics, neither products nor a significant roughness particles was observed. SiC observed product SiO2,...
Porous CaZrO 3 /MgAl 2 O 4 composites were synthesized in air by pressureless reactive sintering of an equimolar mixture dolomite (CaMg(CO ) ), monoclinic zirconia ( m ‐ZrO and α‐alumina powders, with a 0.5 wt% lithium fluoride additive. The reaction behavior the mixed powders (with/without LiF additive) was studied using high‐temperature X‐ray diffraction. A bulk porous composite resulted from at 1300°C for h (in nearly closed container, so as to increase LiF‐doping effect), which consisted...