Advance of Sintering Methods of High Purity Alumina Ceramics

2016 ◽  
Vol 703 ◽  
pp. 76-80 ◽  
Author(s):  
Qing Bo Tian ◽  
Jin Shan Dai ◽  
Li Na Xu ◽  
Xiu Hui Wang
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
High Purity ◽  
Alumina Ceramics ◽  
Grain Coarsening ◽  
Plasma Sintering ◽  
Wide Range ◽  
High Pressure Sintering ◽  
Conventional Sintering ◽  
Spark Plasma

The sintering of alumina ceramics with high-purity has gained much attention due to their wide range applications. The improved sinteirng methods, such as the spark plasma sintering, super-high pressure sintering, two-step sintering, and so on, have advantages on the decreasing the sinteirng temperature or inhibiting the grain coarsening, compared with the conventional sintering.

Processing and Properties of Ceramic Nanocomposites Produced from Polymer Precursor Pyrolysis, High Pressure Sintering and Spark Plasma Sintering

2000 ◽  
Vol 634 ◽  
Author(s):  
Julin Wan ◽  
Matt J. Gasch ◽  
Joshua D. Kuntz ◽  
Rajiv Mishra ◽  
Amiya K. Mukherjee
Keyword(s):  
Silicon Carbide ◽  
High Pressure ◽  
Silicon Nitride ◽  
Spark Plasma Sintering ◽  
Structural Integrity ◽  
Nano Composites ◽  
Polymer Precursor ◽  
Plasma Sintering ◽  
High Pressure Sintering ◽  
Spark Plasma

ABSTRACTSilicon nitride/silicon carbide nanocomposites and alumina-based nanocomposites were investigated in an effort to produce materials with high structural integrity and service properties. Bulk nano-nano composites of silicon nitride and silicon carbide were processed by crystallization of amorphous Si-C-N ceramics that were consolidated in-situ during pyrolysis of a polymer precursor. This material was developed for the purpose of examining the creep behavior of covalent ceramics when there is no oxide glassy phase at grain boundaries. Si3N4/SiC micro-nano composites were sintered by spark plasma sintering (SPS), aiming at better microstructural control and improved creep resistance. Composites of alumina with diamond, silicon carbide and metal (Nb) were developed by high pressure sintering and SPS. These composites maintain microstructures with a nanometric alumina matrix and are targeted for studying the toughening mechanisms and superplastic deformation mechanisms.

Preparation of Porous Alumina Ceramics by Spark Plasma Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 1056-1059
Author(s):  
Won Seung Cho ◽  
Yeon Chul Yoo ◽  
Chin Myung Whang ◽  
Nam Hee Cho ◽  
Woon Suk Hwang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Rapid Heating ◽  
Porous Alumina ◽  
High Porosity ◽  
Alumina Ceramics ◽  
Porous Bodies ◽  
Plasma Sintering ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Highly Porous

Porous alumina bodies were successfully prepared by spark plasma sintering of alumina powders with different amounts of graphite, and by subsequently burning out the graphite. Highly porous bodies were fabricated by spark plasma sintering at 1000°C for 3 min under a pressure of 30 MPa. The heating rate was 80°C/min, and the pulse pattern (on-off) was 12:2. For example, alumina bodies prepared by the addition of 10 ~ 30 vol% graphite showed high porosity of 50 ~ 57%. Porous alumina bodies prepared by the addition of 10 ~ 30 vol% graphite had a high compressive strength of 200 ± 55 MPa, about 35 times higher than those obtained on samples prepared by pressureless sintering, and about 2.5 times higher than those in samples prepared by hot-pressing. The significant improvement in strength relative to values obtained with conventional sintering was attributed to better sintering resulting from the rapid heating between particles.

scholarly journals Synthesis, microstructure, and properties of high purity Mo2TiAlC2 ceramics fabricated by spark plasma sintering

2020 ◽  
Vol 9 (6) ◽  
pp. 759-768
Author(s):  
Yunhui Niu ◽  
Shuai Fu ◽  
Kuibao Zhang ◽  
Bo Dai ◽  
Haibin Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Layered Structure ◽  
High Purity ◽  
High Fracture Toughness ◽  
Temperature Range ◽  
Microstructure And Properties ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractThe synthesis, microstructure, and properties of high purity dense bulk Mo2TiAlC2 ceramics were studied. High purity Mo2TiAlC2 powder was synthesized at 1873 K starting from Mo, Ti, Al, and graphite powders with a molar ratio of 2:1:1.25:2. The synthesis mechanism of Mo2TiAlC2 was explored by analyzing the compositions of samples sintered at different temperatures. It was found that the Mo2TiAlC2 phase was formed from the reaction among Mo3Al2C, Mo2C, TiC, and C. Dense Mo2TiAlC2 bulk sample was prepared by spark plasma sintering (SPS) at 1673 K under a pressure of 40 MPa. The relative density of the dense sample was 98.3%. The mean grain size was 3.5 μm in length and 1.5 μm in width. The typical layered structure could be clearly observed. The electrical conductivity of Mo2TiAlC2 ceramic measured at the temperature range of 2–300 K decreased from 0.95 × 106 to 0.77 × 106 Ω–1·m–1. Thermal conductivity measured at the temperature range of 300–1273 K decreased from 8.0 to 6.4 W·(m·K)–1. The thermal expansion coefficient (TEC) of Mo2TiAlC2 measured at the temperature of 350–1100 K was calculated as 9.0 × 10–6 K–1. Additionally, the layered structure and fine grain size benefited for excellent mechanical properties of low intrinsic Vickers hardness of 5.2 GPa, high flexural strength of 407.9 MPa, high fracture toughness of 6.5 MPa·m1/2, and high compressive strength of 1079 MPa. Even at the indentation load of 300 N, the residual flexural strength could hold 84% of the value of undamaged one, indicating remarkable damage tolerance. Furthermore, it was confirmed that Mo2TiAlC2 ceramic had a good oxidation resistance below 1200 K in the air.

scholarly journals Processing of MMC through conventional sintering and spark plasma sintering process: A review

2020 ◽  
Vol 988 ◽  
pp. 012092
Author(s):  
B Stalin ◽  
M Ravichandran ◽  
M Balasubramanian ◽  
C Anand Chairman ◽  
D Pritima ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Conventional Sintering ◽  
Spark Plasma

Preparation and Magnetic Properties of Dense NiCuZn Ferrite by Spark Plasma Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 601-603
Author(s):  
Xi Wei Qi ◽  
Ji Zhou ◽  
Zhen Xing Yue ◽  
Ming Ya Li ◽  
Xiu Mei Han
Keyword(s):  
Spark Plasma Sintering ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Impurity Phase ◽  
Uniaxial Pressure ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Nicuzn Ferrite

Dense NiCuZn ferrites consisting of fine grains were prepared by spark plasma sintering (SPS) at 750°C for 3 min under a uniaxial pressure of 15 MPa. The powders were densified to >95% of theoretical density by the SPS process, and the average grain size of the prepared NiCuZn ferrite was < 1 /m. The saturation magnetization of prepared specimens (without further annealing treatment) was approximate 50.54 emu/g, which was slightly smaller than that of 52.21 emu/g for specimens prepared by conventional sintering at 980°C for 4 h. Phase identifications indicated that prepared NiCuZn ferrite existed impurity phase (Cu2O), and Cu2O would gradually transform to CuO when annealing temperature increased.

scholarly journals Microstructure of AlCrFeSi Alloys Prepared by High-Pressure Spark Plasma Sintering

2018 ◽  
Vol 18 (5) ◽  
pp. 753-757
Author(s):  
Anna Knaislová ◽  
Daniel Kučera ◽  
Alena Michalcová ◽  
Ivo Marek ◽  
Sławomir Cygan ◽  
...  
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

Highly Infrared Transparent Nanometric Tetragonal Zirconia Prepared by High-Pressure Spark Plasma Sintering

2011 ◽  
Vol 94 (9) ◽  
pp. 2739-2741 ◽  
Author(s):  
Haibin Zhang ◽  
Zhipeng Li ◽  
Byung-Nam Kim ◽  
Koji Morita ◽  
Hidehiro Yoshida ◽  
...  
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
Tetragonal Zirconia ◽  
Plasma Sintering ◽  
Spark Plasma

Optical and mechanical properties of transparent alumina fabricated by high-pressure spark plasma sintering

2019 ◽  
Vol 39 (8) ◽  
pp. 2712-2719 ◽  
Author(s):  
Barak Ratzker ◽  
Avital Wagner ◽  
Maxim Sokol ◽  
Sergey Kalabukhov ◽  
Moshe P. Dariel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Spark Plasma Sintering ◽  
Transparent Alumina ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Optical And Mechanical Properties

scholarly journals Spark Plasma Sintering of Ceramics: From Modeling to Practice

Ceramics ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 476-493
Author(s):  
Michael Stuer ◽  
Paul Bowen ◽  
Zhe Zhao
Keyword(s):  
Spark Plasma Sintering ◽  
Ceramic Materials ◽  
Model Material ◽  
Operational Parameters ◽  
Key Factors ◽  
Engineering Approach ◽  
Plasma Sintering ◽  
Wide Range ◽  
Spark Plasma ◽  
Industrial Settings

Summarizing the work of nearly a decade of research on spark plasma sintering (SPS), a review is given on the specificities and key factors to be considered in SPS of ceramic materials, based on the authors’ own research. Alumina is used primarily as a model material throughout the review. Intrinsic inhomogeneities linked to SPS and operational parameters, which depend on the generation of atomistic scale defects, are discussed in detail to explain regularly observed inhomogeneities reported in literature. Adopting an engineering approach to overcome these inherent issues, a successful processing path is laid out towards the mastering of SPS in a wide range of research and industrial settings.

Sign in / Sign up

Export Citation Format

Share Document