Preparation of diamond/aluminum composite with titanium coating on diamond powder by microwave technology

2021 ◽  
Vol 11 (12) ◽  
pp. 2015-2023
Author(s):  
Zhaohui Han ◽  
Yang Xu ◽  
Lei Xu ◽  
Shenghui Guo
Keyword(s):  
Relative Density ◽  
Microwave Sintering ◽  
Diamond Powder ◽  
Raw Material ◽  
Titanium Coating ◽  
Microwave Technology ◽  
Aluminum Composite ◽  
High Relative Density ◽  
Diamond Particles ◽  
Metallic Bond

In this research, the diamond particles were coated with titanium by microwave heating method, then the Ti-coated diamond particles were used as raw material to fabricate the diamond/Al composites by microwave sintering. The result shows that the diamond particles could be covered with a uniform and continuous Ti coating under microwave irradiation, and the best Ti coating was obtained at 810 °C for 1 h. The metallic bond between diamond and Ti was formed to generate the intermediate transition layer of TiC. The diamond/Al composites which used Ti-coated diamond particles as raw material and were fabricated by microwave sintering show high relative density and hardness. The relative density and hardness of the diamond/Al composites increased with the temperature. While the composites were sintered at 710 °C for 1 h, the density could reach 2.855 g·cm−3, and relative density was 92.09%, which shows better microstructures and properties. There is Al3Ti alloy phase in Ti-coated diamond/Al composites, so the Ti-coated diamond can be well combined with the Al matrix, which can further improve the properties of the composites.

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yushen Wang ◽  
Wei Xiong ◽  
Danna Tang ◽  
Liang Hao ◽  
Zheng Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Diamond Powder ◽  
Thermal Imager ◽  
Corrosion Properties ◽  
Content Type ◽  
Sensor Material ◽  
Direct Ink Writing ◽  
Diamond Particles ◽  
Before And After

Purpose Traditional simulation research of geological and similar engineering models, such as landslides or other natural disaster scenarios, usually focuses on the change of stress and the state of the model before and after destruction. However, the transition of the inner change is usually invisible. To optimize and make models more intelligent, this paper aims to propose a perceptible design to detect the internal temperature change transformed by other energy versions like stress or torsion. Design/methodology/approach In this paper, micron diamond particles were embedded in 3D printed geopolymers as a potential thermal sensor material to detect the inner heat change. The authors use synthetic micron diamond powder to reinforced the anti-corrosion properties and thermal conductivity of geopolymer and apply this novel geopolymer slurry in the direct ink writing (DIW) technique. Findings As a result, the addition of micron diamond powder can greatly influence the rheology of geopolymer slurry and make the geopolymer slurry extrudable and suitable for DIW by reducing the slope of the viscosity of this inorganic colloid. The heat transfer coefficient of the micron diamond (15 Wt.%)/geopolymer was 50% higher than the pure geopolymer, which could be detected by the infrared thermal imager. Besides, the addition of diamond particles also increased the porous rates of geopolymer. Originality/value In conclusion, DIW slurry deposition of micron diamond-embedded geopolymer (MDG) composites could be used to manufacture the multi-functional geological model for thermal imaging and defect detection, which need the characteristic of lightweight, isolation, heat transfer and wave absorption.

scholarly journals High relative density of lymphatic vessels predicts poor survival in tongue squamous cell carcinoma

2016 ◽  
Vol 273 (12) ◽  
pp. 4515-4524 ◽  
Author(s):  
Miia Seppälä ◽  
Konsta Pohjola ◽  
Jussi Laranne ◽  
Markus Rautiainen ◽  
Heini Huhtala ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Relative Density ◽  
Squamous Cell ◽  
Lymphatic Vessels ◽  
Tongue Squamous Cell Carcinoma ◽  
Poor Survival ◽  
High Relative Density

Praseodymium and neodymium phosphates Ca9Ln(PO4)7 of whitlockite structure. Preparation of a ceramic with a high relative density

2014 ◽  
Vol 56 (4) ◽  
pp. 380-384 ◽  
Author(s):  
A. I. Orlova ◽  
N. V. Malanina ◽  
V. N. Chuvil’deev ◽  
M. S. Boldin ◽  
N. V. Sakharov ◽  
...  
Keyword(s):  
Relative Density ◽  
High Relative Density ◽  
Whitlockite Structure

Thermal Expansion of SrZr4-xTix(PO4)6 Ceramics

2018 ◽  
Vol 281 ◽  
pp. 169-174
Author(s):  
Yang Wang ◽  
Yuan Yuan Song ◽  
Yuan Yuan Zhou ◽  
Lu Ping Yang ◽  
Fu Tian Liu
Keyword(s):  
Thermal Expansion ◽  
Relative Density ◽  
Thermophysical Properties ◽  
Sintering Temperature ◽  
Temperature Range ◽  
Thermal Expansion Coefficients ◽  
High Relative Density ◽  
Low Thermal Expansion ◽  
Expansion Coefficients

Low thermal expansion ceramics have been widely applied in multiple fields. In this paper, a series of low thermal expansion ceramics SrZr4-xTix(PO4)6 was prepared and characterized. The SrZr4-xTix(PO4)6 ceramics could be well sintered in the temperature range of 1400~1500 °C. The effect of the addition of Ti substituting Zr and the sintering temperature was studied. The Ceramic with x =0.1 sintered at 1450 °C, the SrZr4-xTix(PO4)6 had a high relative density. The thermal expansion coefficients were about 3.301×10-6 °C-1. It was demonstrated that the microstructure of the SrZr4-xTix(PO4)6 could be altered by adding varying amount of Ti to tailor the thermophysical properties of the material.

Study on Structure and Properties of Porous Copper Alloy

2013 ◽  
Vol 833 ◽  
pp. 301-304
Author(s):  
Hao Zhong ◽  
Yun Zhou
Keyword(s):  
Compressive Strength ◽  
Relative Density ◽  
Pore Size ◽  
Alloy Powder ◽  
Sintering Temperature ◽  
Raw Material ◽  
Structure And Properties ◽  
Pore Former ◽  
Porous Copper ◽  
Increasing Trend

CuSn6Zn6 alloy powder and a pore former were used as raw material. Porous bronze was successfully prepared by the sintering and dissolution process (SDP). The porosity is in range of 76%~88%, and the pore size is in range of 0.8~3.3mm. The effect of the porosity and cell sizes of specimens on its mechanical property was investigated, and the effect of sintering temperature on its relative density and porosity was also studied. The experimental results indicate that under the condition of the same pore size, the compressive strength decreases with the increase of porosity, the compressive strength changes from 10Mpa to 2Mpa with the porosity from 76% to 88%; under the same porosity condition, the compressive strength does not change significantly with the pore size, but it has a slightly increasing trend with the decrease of the pore size. The relative density of the specimens increases with the increase of the sintering temperature.

Preparation of 10B Enriched B4C Ceramics by Pressureless Sintering

2014 ◽  
Vol 602-603 ◽  
pp. 540-543
Author(s):  
Yu Jun Zhang ◽  
Sha Li Tan ◽  
Ru Bin Wei ◽  
Shu He Ai ◽  
Hai Bin Sun
Keyword(s):  
Flexural Strength ◽  
Boron Carbide ◽  
Relative Density ◽  
Sintering Temperature ◽  
Raw Material ◽  
Carbide Powder ◽  
Average Particle ◽  
Strength Increase ◽  
Pressureless Sintering ◽  
Water Reactors

Boron carbide is an attractive neutron absorbing material used both in Fast Breeder Reactors (FBR) and in Pressurised Water Reactors (PWR) owing to its very high absorption cross section for thermal neutrons, chemical stability and refractory character. In the present paper, 10B enriched B4C ceramics are prepared by pressureless sintering at 19602160°C, under argon, using 10B boron carbide powder as raw material, 18 wt% phenolic resin as sintering aid. In the sintering temperature range, with the increasing of sintering temperature, both the relative density and flexural strength increase linearly, the average particle sizes increase from about 3μm at 1960°C to more than 30μm at 2160°C. The sample sintered at 1960°C has a 91.7% of relative density and 192 MPa of flexural strength and a homogeneous texture with 3-4μm particle size, which are enough for pellet application of reactors.

Densification of TiCN Matrix Cermets by Microwave Sintering

2011 ◽  
Vol 216 ◽  
pp. 579-582 ◽  
Author(s):  
Si Wen Tang ◽  
Hou An Zhang ◽  
Jian Hui Yan
Keyword(s):  
Relative Density ◽  
Sintering Temperature ◽  
Microwave Sintering ◽  
Protective Atmosphere ◽  
Densification Process ◽  
Sintering Time ◽  
Vacuum Microwave ◽  
Prepared Material ◽  
Higher Temperature ◽  
Reduce Energy Consumption

TiCN matrix cermets were prepared by using traditional sintering and microwave sintering. The effect of sintering methods, sintering temperature and protective atmosphere to the densification process of as prepared material were discussed. The results show that microwave sintering can short the sintering time than the traditional sintering, but it need higher temperature to obtain approximate density. At 1500°C,holding 5min, vacuum microwave sintering can gain relative density of 99.5%. The relative density of TiCN matrix cermets under argon shield is lower than vacuum microwave sintering, and the microscopic particles is more small, but the uniformity of pore is reduced. Microwave sintering can greatly reduce energy consumption.

UV-Enhanced Bioactivity of PS/TiO2 Coating Prepared by Layer-by-Layer Self-Assembly Method

2010 ◽  
Vol 434-435 ◽  
pp. 579-581
Author(s):  
Zhi Xian Zhang ◽  
Fan Xiao ◽  
Fei Gao
Keyword(s):  
Uv Irradiation ◽  
Ultraviolet Irradiation ◽  
Self Assembly ◽  
Raw Material ◽  
Layer By Layer ◽  
Titanium Coating ◽  
Water Contact ◽  
Oh Groups ◽  
Assembly Method ◽  
Assembly Technology

The TiO2 nanopowder was prepared with TiOSO4 as raw material at low temperature by hydrolysis method, and microspheres coated polyethylene and TiO2 were then fabricated on titanium by layer-by-layer self-assembly technology. Using ultraviolet irradiation of titanium coating in distilled water for some time, titanium with enhanced bioactivity was achieved when immersed in simulated body fluid (SBF). The morphology, size and crystal shape before and after ultraviolet irradiation were characterized by scanning electron microcopy (SEM) and X-ray diffraction (XRD). UV irradiation of titanium results in the conversion of Ti4+ to Ti3+ and the generation of oxygen vacancies, which could react with the absorbed water to form basic Ti–OH groups. Compared with the coating non-UV irradiation, the UV-irradiated coatings do not present any obvious differences in morphology, surface roughness, grain size and phase component; however, they have more abundant basic Ti–OH groups thus the water contact angle decreases greatly so the surface become much more hydrophilic.

Preparation of Hydroxyapatite Ceramics by Hydrothermal Hot-Pressing Technique

2006 ◽  
Vol 309-311 ◽  
pp. 57-60 ◽  
Author(s):  
Kazumichi Yanagisawa ◽  
Kongjun Zhu ◽  
Takahiro Fujino ◽  
Ayumu Onda ◽  
Koji Kajiyoshi ◽  
...  
Keyword(s):  
Reaction Time ◽  
Relative Density ◽  
Reaction Temperature ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
High Relative Density ◽  
Hydroxyapatite Ceramics ◽  
Processing Factors ◽  
Low Crystallinity

The hydrothermal hot-pressing (HHP) technique was used to prepare hydroxyapatite (HAp) ceramics from a HAp powder with low crystallinity, and the effects of processing factors such as temperature, loading pressure and reaction time on densification were investigated. The crystallinity of HAp was increased by the HHP treatments. With the increase in reaction temperature, loading pressure and reaction time, the density and Vickers hardness of the compacts increased. The HAp compact with high relative density of 83% and high Vickers hardness of 2.9 GPa was successfully prepared by the HHP treatment at 200°C for 3 h under loading pressure of 60 MPa.

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