Sintering Additives for Garnet-Type Electrolytes

2019 ◽  
pp. 111-128
Author(s):  
Nataly C. Rosero-Navarro ◽  
Kiyoharu Tadanaga
Keyword(s):  
Sintering Additives

Electron Microscopy of Silicon Nitride-Based Ceramics

1991 ◽  
Vol 49 ◽  
pp. 926-927
Author(s):  
Gareth Thomas
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Silicon Nitride ◽  
World Wide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
High Temperature Strength ◽  
Sintering Additives ◽  
Glass Forming ◽  
Dense Product

Silicon nitride and silicon nitride based-ceramics are now well known for their potential as hightemperature structural materials, e.g. in engines. However, as is the case for many ceramics, in order to produce a dense product, sintering additives are utilized which allow liquid-phase sintering to occur; but upon cooling from the sintering temperature residual intergranular phases are formed which can be deleterious to high-temperature strength and oxidation resistance, especially if these phases are nonviscous glasses. Many oxide sintering additives have been utilized in processing attempts world-wide to produce dense creep resistant components using Si3N4 but the problem of controlling intergranular phases requires an understanding of the glass forming and subsequent glass-crystalline transformations that can occur at the grain boundaries.

Influence of sintering additives of transition metals on the properties of gadolinium-doped barium cerate

2008 ◽  
Vol 179 (21-26) ◽  
pp. 887-890 ◽  
Author(s):  
E. Gorbova ◽  
V. Maragou ◽  
D. Medvedev ◽  
A. Demin ◽  
P. Tsiakaras
Keyword(s):  
Transition Metals ◽  
Barium Cerate ◽  
Sintering Additives ◽  
Doped Barium Cerate

Oxidation Behavior of Amorphous Nano-Si3N4 Powders

2014 ◽  
Vol 602-603 ◽  
pp. 367-370 ◽  
Author(s):  
Jiang Bo Wen ◽  
Sheng Huang ◽  
Hong Jie Wang
Keyword(s):  
High Temperature ◽  
Partial Pressure ◽  
Mechanical Behavior ◽  
Low Temperatures ◽  
Traditional Method ◽  
Oxidation Behavior ◽  
Oxidation Process ◽  
Composite Ceramic ◽  
Intergranular Phase ◽  
Sintering Additives

The traditional method preparing Si3N4/Si2N2O composite ceramic is to sinter α-Si3N4 powder with additives at relatively high temperatures. But the intergranular phase transformed from the sintering additives can degrade the high-temperature mechanical behavior. Amorphous nanoSi3N4 is used to fabricate Si3N4/Si2N2O composite ceramic by its oxidation and nitridation without sintering additives at low temperatures. Thus, it is essential to study the oxidation behavior and mechanism of amorphous nanoSi3N4. Amorphous nanoSi3N4 powders were oxidized in different atmospheres, at varying temperatures and for various different length of time. The oxidation process and products was analyzed by means of XRD, TGA and FTIR. The results showed that amorphous nanoSi3N4 could be oxidized into SiO2 from 600°C to 1300°C. Below 1300°C, the oxidation became serious as the temperature increased. Besides, the longer the oxidation time and the lager the ratio of O2/N2 partial pressure was, the deeper the oxidation level was. When the temperature was above 1300°C, amorphous nanoSi3N4 was completely oxidized into SiO2.

Effect of rare-earth species on the wear properties of α sialon and β silicon nitride ceramics under tribochemical type conditions

2004 ◽  
Vol 19 (9) ◽  
pp. 2750-2758 ◽  
Author(s):  
Mark I. Jones ◽  
Kiyoshi Hirao ◽  
Hideki Hyuga ◽  
Yukihiko Yamauchi
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Wear Behavior ◽  
Rare Earth Oxide ◽  
Lower Amount ◽  
Boundary Phase ◽  
Wear Properties ◽  
Sintering Additives ◽  
Nitride Ceramics ◽  
Worn Surfaces

The wear properties under low loads of β Si3N4 and α sialon materials sintered with different rare-earth oxide sintering additives have been studied under dry sliding conditions using block-on-ring wear tests. All the worn surfaces showed an absence of fracture and smooth surfaces with the presence of an oxygen-rich filmlike debris indicating tribochemically induced oxidation of the surfaces. Extensive grain boundary removal was observed on the worn surfaces thought to be due to adhesion between this silicate phase and the tribochemically oxidized surfaces. The resistance to such oxidation and the properties of the residual grain boundary phase are thought to be important parameters affecting the wear behavior under the present testing conditions. For both the β Si3N4 and α sialon materials, there was an increase in wear resistance with decreasing cationic radius of the rare earth, thought to be due to improved oxidation resistance, and this was more remarkable in the case of the sialon materials where the incorporation of the sintering additives into the Si3N4 structure results in a lower amount of residual boundary phase.

Effects of Oxidation Curing and Sintering Additives on the Formation of Polymer-Derived Near-Stoichiometric Silicon Carbide Fibers

2008 ◽  
Vol 91 (2) ◽  
pp. 428-436 ◽  
Author(s):  
Lifu Chen ◽  
Li Zhang ◽  
Zhihui Cai ◽  
Yuxi Yu ◽  
Hui Gu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Sintering Additives ◽  
Silicon Carbide Fibers

ChemInform Abstract: In situ Incorporation of Sintering Additives in Si3N4 Powder by a Combustion Process.

ChemInform ◽  
2010 ◽  
Vol 30 (15) ◽  
pp. no-no
Author(s):  
Liwu Wang ◽  
Sukumar Roy ◽  
Wolfgang Sigmund ◽  
Fritz Aldinger
Keyword(s):  
Combustion Process ◽  
Sintering Additives ◽  
Si3n4 Powder

Comparison of the proton irradiation-induced damage in SiCf/SiC with Sc-nitrate and Al2O3-Y2O3 sintering additives

2018 ◽  
Vol 38 (7) ◽  
pp. 2823-2831 ◽  
Author(s):  
Amit Siddharth Sharma ◽  
Pipit Fitriani ◽  
Bong-Ki Min ◽  
Dong-Hyok Yoon
Keyword(s):  
Proton Irradiation ◽  
Sintering Additives
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