scholarly journals The Influence of Sintering Additives and HIP Pressure in Sintering Process on Micro-Structures and Mechanical Properties of Si3N4 Ceramics

2009 ◽  
Vol 56 (7) ◽  
pp. 433-437
Author(s):  
Mitsuyoshi Nagano ◽  
Shinzo Mitomi
Keyword(s):  
Mechanical Properties ◽  
Sintering Process ◽  
Sintering Additives ◽  
Micro Structures ◽  
Si3n4 Ceramics

Development of High Performance Silicon Nitride Ceramics and their Applications

1992 ◽  
Vol 287 ◽  
Author(s):  
Yo Tajima
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
High Performance ◽  
Future Prospect ◽  
Cutting Tools ◽  
Sintering Process ◽  
Sintering Additives ◽  
Nitride Ceramics ◽  
Engine Components

ABSTRACTProgress in sintering process and improvement of mechanical properties of silicon nitride ceramics are reviewed. Emphases are placed on contributions of advanced sintering techniques and better understanding of sintering additives and microstructure-properties relations. Current applications as engine components and cutting tools are described, and future prospect is considered.

Mechanical properties and thermal conductivity of Si3N4 ceramics with YF3 and MgO as sintering additives

2016 ◽  
Vol 42 (14) ◽  
pp. 15679-15686 ◽  
Author(s):  
Hanqin Liang ◽  
Yuping Zeng ◽  
Kaihui Zuo ◽  
Yongfeng Xia ◽  
Dongxu Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Sintering Additives ◽  
Si3n4 Ceramics

Effect of Hexagonal BN on the Microstructure and Mechanical Properties of Pressureless Sintered Porous Si3N4 Ceramics

2010 ◽  
Vol 434-435 ◽  
pp. 697-700
Author(s):  
Yong Feng Li ◽  
Ping Liu ◽  
Xiang Dong Wang ◽  
Hai Yun Jin ◽  
Guan Jun Qiao
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Phase Transformation ◽  
Hexagonal Boron Nitride ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Porous Si ◽  
Microstructure And Mechanical Properties ◽  
Nitride Ceramics ◽  
Si3n4 Ceramics

Porous silicon nitride ceramics with various amounts (25, 35, and 45 vol %) of hexagonal boron nitride (h-BN) were fabricated at 1800°C for 2h by the pressureless sintering process. With FESEM and TEM, the effects of h-BN on the microstructure and mechanical properties of Si3N4 ceramics were investigated. Results of the microstructure and mechanical properties of Si3N4/BN composites showed that the growth of the elongated β-Si3N4 were hindered by h-BN additive, which resulted in the decrease of fracture toughness of Si3N4/BN ceramics with increasing h-BN content. The morphologies of the fracture surfaces by FESEM revealed the fracture mode for Si3N4/BN composites to be intergranular. However, phase analysis by XRD indicated that the effect of h-BN on the α- to β- Si3N4 phase transformation of Si3N4/BN composites was negligible.

scholarly journals Influence of powder characteristics on hot-pressed Si3N4 ceramics

2017 ◽  
Vol 49 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Qiang-Guo Jiang ◽  
Wei-Ming Guo ◽  
Wei Liu ◽  
Shang-Xian Gu ◽  
Li-Xia Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Growth ◽  
Powder Processing ◽  
Particle Morphology ◽  
Sintering Behavior ◽  
Powder Size ◽  
Sintering Additives ◽  
Powder Characteristics ◽  
In The Beginning ◽  
Si3n4 Ceramics

In this paper, the influence of the starting powder characteristics for five commercial Si3N4 powders on sintering behavior, microstructure and mechanical properties of hot-pressed Si3N4 ceramics with and without the addition of La2O3-Yb2O3-MgO sintering additives was investigated. For the system without sintering additives, the high amount of the impurities in the starting powders could facilitate the densification process and promote ?-Si3N4 grain growth. However, large whisker-like particles (? phase) present in the initial powders inhibited the sintering process, which led to a lower density of Si3N4 ceramics. On the other hand, when the sintering additives were introduced in the beginning stage of the powder processing step, the effects of impurities content and particle morphology in the initial powders on the densification and microstructure were not apparent. There was tendency that finer powder size resulted in finer microstructure. However, a high ?-phase ratio in the initial powders could accelerate the abnormal grain growth and thus lead to better mechanical properties.

Effect of LiCl on Mechanics Property of HA Ceramics During Sintering

2006 ◽  
Vol 309-311 ◽  
pp. 1125-1128
Author(s):  
F.X. Jiang ◽  
Qian Peng ◽  
Lie Feng Liang ◽  
Jie Weng
Keyword(s):  
Mechanical Properties ◽  
Sintering Process ◽  
Load Bearing ◽  
Sintering Additives ◽  
The Relationship

Hydroxyapatite (HA) which has excellent biocompatibility and osteoconductivity is limited in the load-bearing repair because of its brittleness. Applying appropriate sintering additives for HA is a possible way to improve its mechanical properties. Systematic studies have has been performed to investigate the effect of LiCl as an additive on the microstructure and sinterability of HA and the relationship to its mechanical properties. The densification of HA containing different LiCl contents was completed through a special sintering process with the highest temperature of 1280°C. Microhardness was tested as a short cut to evaluate the changes of mechanical properties affected by the microstructure of HA doped with LiCl. The results of the experiment showed that LiCl is an effective sintering agent which causes neither decomposition of HA nor formation of other undesired phases with the increase of its microhardness.

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma
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