Si‐rich pressureless sintering of the gelcasted Ti 3 SiC 2 bulk ceramic

2021 ◽  
Author(s):  
Zhanchong Zhao ◽  
Xianhui Li ◽  
Xian Zeng ◽  
Huayan Liu ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Pressureless Sintering ◽  
Bulk Ceramic

Preparation of Zirconium Titanate Ceramics by Alloy Oxidation Method

2013 ◽  
Vol 634-638 ◽  
pp. 2402-2405 ◽  
Author(s):  
Wen Jie Yuan ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu ◽  
Jun Li
Keyword(s):  
Single Phase ◽  
Pressureless Sintering ◽  
Zirconium Titanate ◽  
X Ray Diffraction ◽  
Homogeneous Microstructure ◽  
Oxidation Method ◽  
Bulk Ceramic ◽  
Maximum Value ◽  
Alloy Oxidation ◽  
Titanate Ceramics

In this paper, the investigations are presented for preparation of zirconium titanate ceramics by pressureless sintering of powders obtained by alloy oxidation method. ZrxTi1-xO2 (x=0.40-0.60) powders were prepared by the oxidation of Zr-Ti alloys. The zirconium titanate powders were sintered in the temperature range from 1400 to 1600 °C for 3 h by pressureless sintering. The relationships among the composition, the relative densities and microstructure of bulk ceramic were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show the sintering and microstructure of single phase zirconium titanate ceramics varied with ZrO2 content. The relative density of samples reaches the maximum value of near 92% when sintering temperature is up to 1600 °C. Irregular pores distributed uniformly among the particles in the sintered ceramics with homogeneous microstructure.

Preparation of Ti3AlC2 bulk ceramic via aqueous gelcasting followed by Al-rich pressureless sintering

2020 ◽  
Vol 40 (8) ◽  
pp. 2878-2886 ◽  
Author(s):  
Zhanchong Zhao ◽  
Xianhui Li ◽  
Xian Zeng ◽  
Xiaoxin Zhang ◽  
Qingzhi Yan
Keyword(s):  
Pressureless Sintering ◽  
Bulk Ceramic

scholarly journals Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

2021 ◽  
Vol 7 (5) ◽  
pp. 56
Author(s):  
Yimin Yang ◽  
Xiaoying Li ◽  
Ziyu Liu ◽  
Dianjun Hu ◽  
Xin Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Calcination Temperature ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Secondary Phase ◽  
Coprecipitation Method ◽  
Pressureless Sintering ◽  
Densification Behavior ◽  
Sintering Process

Nanoparticles prepared by the coprecipitation method were used as raw materials to fabricate Y3Fe5O12 (YIG) ceramics by air pressureless sintering. The synthesized YIG precursor was calcinated at 900–1100 °C for 4 h in air. The influences of the calcination temperature on the phase and morphology of the nanopowders were investigated in detail. The powders calcined at 1000–1100 °C retained the pure YIG phase. YIG ceramics were fabricated by sintering at 1200–1400 °C for 10 h, and its densification behavior was studied. YIG ceramics prepared by air sintering at 1250 °C from powders calcinated at 1000 °C have the highest in-line transmittance in the range of 1000-3000 nm. When the sintering temperature exceeds 1300 °C, the secondary phase appears in the YIG ceramics, which may be due to the loss of oxygen during the high-temperature sintering process, resulting in the conversion of Fe3+ into Fe2+.

scholarly journals Scintillation and luminescence in transparent colorless single and polycrystalline bulk ceramic ZnS

2015 ◽  
Vol 157 ◽  
pp. 416-423 ◽  
Author(s):  
John S. McCloy ◽  
Mary Bliss ◽  
Brian Miller ◽  
Zheming Wang ◽  
Sean Stave
Keyword(s):  
Bulk Ceramic

scholarly journals Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Ghadami ◽  
E. Taheri-Nassaj ◽  
H. R. Baharvandi ◽  
F. Ghadami
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Relative Density ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Vacuum Atmosphere ◽  
Sic Reinforcement ◽  
Microstructural Studies ◽  
Composite Samples

AbstractHfB2, Si, and activated carbon powders were selected to fabricate 0–30 vol% SiC reinforced HfB2-based composite. Pressureless sintering process was performed at 2050 °C for 4 h under a vacuum atmosphere. Microstructural studies revealed that in situ SiC reinforcement was formed and distributed in the composite according to the following reaction: Si + C = SiC. A maximum relative density of 98% was measured for the 20 vol% SiC containing HfB2 composite. Mechanical investigations showed that the hardness and the fracture toughness of these composites were increased and reached up to 21.2 GPa for HfB2-30 vol% SiC and 4.9 MPa.m1/2 for HfB2-20 vol% SiC, respectively. Results showed that alpha-SiC reinforcements were created jagged, irregular, and elongated in shape which were in situ formed between HfB2 grains and filled the porosities. Formation of alpha-SiC contributed to improving the relative density and mechanical properties of the composite samples. By increasing SiC content, an enhanced trend of thermal conductivity was observed as well as a reduced trend for electrical conductivity.

scholarly journals Fabrication of Hydroxyapatite/Tantalum Composites by Pressureless Sintering in Different Atmosphere

ACS Omega ◽  
2021 ◽  
Author(s):  
Cuiling Cai ◽  
Xinyu Wang ◽  
Binbin Li ◽  
Kuo Dong ◽  
Ying Shen ◽  
...  
Keyword(s):  
Pressureless Sintering
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