Hot-Pressed Silicon Nitride Ceramics With Rare-Earth Oxides Additives

1985 ◽  
Author(s):  
Xu Youren ◽  
Huang Liping ◽  
Fu Xiren ◽  
Yen Tungsheng
Keyword(s):  
Fracture Toughness ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Room Temperature ◽  
Glassy Phase ◽  
Rare Earth Oxides ◽  
Bend Strength ◽  
Silicon Nitride Ceramic ◽  
X Ray ◽  
Nitride Ceramics

A hot-pressed silicon nitride ceramic material with rare-earth oxides additive has been processed, its bend strength maintains 800–900 MPa up to 1300°C and measures 680 MPa at 1400°C, its fracture toughness at room temperature is 4.38–4.96 MPam. X-ray, SEM, EDS and electron probe analyses reveal that the microstructure of this material is composed of fine β-Si3N4 grains, α-Si3N4 whiskers, small tetragonal lanthanide crystals and La-containing glassy phase. Observation on fracture surface shows that the fracture path is mainly transcrystalline up to 1400°C. The effects of additives on strength and fracture toughness of HPSN obtained are also discussed.

Effect of rare earth oxides addition on the mechanical properties and coloration of silicon nitride ceramics

2020 ◽  
Vol 40 (4) ◽  
pp. 1132-1138 ◽  
Author(s):  
Ning Liu ◽  
Jingxian Zhang ◽  
Yusen Duan ◽  
Xingbang Li ◽  
Shaoming Dong
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Oxides ◽  
Nitride Ceramics

Fracture Toughness of Si3N4 Based Ceramics with Rare-Earth Oxide Sintering Additives

2009 ◽  
Vol 409 ◽  
pp. 377-381 ◽  
Author(s):  
Peter Tatarko ◽  
Štefánia Lojanová ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Fracture Toughness ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Aspect Ratio ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Crack Deflection ◽  
Indentation Fracture ◽  
Toughening Mechanisms ◽  
Sintering Additives

Fracture toughness of hot-pressed silicon nitride and Si3N4+SiC nanocomposites prepared with different rare-earth oxides (La2O3, Sm2O3, Y2O3, Yb2O3, Lu2O3) sintering additives have been investigated by Chevron Notched Beam, Indentation Strength and Indentation Fracture techniques. The fracture toughness values of composites were lower due to the finer microstructures and the lack of toughening mechanisms. In the Si3N4 with higher aspect ratio (Lu or Yb additives) crack deflection occurred more frequently compared to the Si3N4 doped with La or Y, which was responsible for the higher fracture toughness.

High-Resolution Interface Atomic Structure Analysis in Silicon Nitride Ceramics

2004 ◽  
Vol 839 ◽  
Author(s):  
A. Ziegler ◽  
J. C. Idrobo ◽  
M. K. Cinibulk ◽  
C. Kisielowski ◽  
N. D. Browning ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Electronic Structure ◽  
Rare Earth ◽  
Silicon Nitride ◽  
High Resolution ◽  
Rare Earth Elements ◽  
Structure Analysis ◽  
Atomic Structure ◽  
Nitride Ceramics ◽  
Ionic Size

ABSTRACTIn this study we examine the immediate interface between matrix grains and the amorphous intergranular film in a Si3N4 ceramic doped with rare-earth oxides La2O3, Sm2O3, Er2O3, Yb2O3 and Lu2O3, extracting unique structural and atomic bonding information. In particular, we relate the structure of the interface to the ionic size and electronic structure of the rare-earth elements and the presence of oxygen in the intergranular film. We relate these results to the measured fracture toughness.

Z-201N

Alloy Digest ◽  
1991 ◽  
Vol 40 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Silicon Nitride ◽  
Room Temperature ◽  
High Strength ◽  
High Fracture Toughness ◽  
Bend Strength ◽  
High Fracture ◽  
Engineering Ceramic ◽  
Room Temperature Strength

Abstract Z-201N is a high strength zirconia engineering ceramic. Its room temperature strength is greater than that of silicon carbide and silicon nitride. It also has high fracture toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and bend strength as well as fracture toughness. Filing Code: Cer-6. Producer or source: Kyocera Industrial Ceramics Corporation.

X-ray Examination of Fracture Surfaces of Silicon Nitride Ceramics

1989 ◽  
Vol 33 ◽  
pp. 319-326 ◽  
Author(s):  
Zenjiro Yajima ◽  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Silicon Nitride ◽  
Fracture Surface ◽  
Fatigue Tests ◽  
Fracture Mechanisms ◽  
X Ray ◽  
Nitride Ceramics ◽  
Zone Depth ◽  
Tip Radius

The residual stress left on the fracture surface is one of the important parameters in X-ray fractography. It has been used to analyze fracture mechanisms in fracture toughness and fatigue tests especially of iron and steels.In the present paper, X-ray fractography was applied to the brittle fracture surface of a silicon nitride ceramics. The first part deals with the determination of the stress constant for diffraction from Si3N4(411) plane by Cr-Kα radiation. The second part describes the effect of the notch-tip radius on the fracture toughness value. In the last part, the plastic zone depth was determined from the residual stress destribution beneath the fracture surface.

DILLIDUR 450V

Alloy Digest ◽  
2011 ◽  
Vol 60 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Room Temperature ◽  
Surface Hardness ◽  
Heat Treating ◽  
Hot Working ◽  
Resistant Steel ◽  
Bend Strength

Abstract Dillidur 450V is a water hardened wear-resistant steel with surface hardness at room temperature of 420-480 HB. The steel is easy to weld and bend. Hot working is not recommended. This datasheet provides information on composition, physical properties, hardness, tensile properties, and bend strength as well as fracture toughness. It also includes information on wear resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-638. Producer or source: Dillinger Hütte GTS.

RMI 6Al-ELI

Alloy Digest ◽  
1988 ◽  
Vol 37 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Room Temperature ◽  
Base Alloy ◽  
Heat Treating ◽  
Age Hardening ◽  
Bend Strength ◽  
Annealed Condition ◽  
Room Temperature Yield Strength ◽  
Alpha Beta

Abstract RMI 6A1-4V ELI is an alpha-beta type of titanium-base alloy that can be strengthened by age hardening. In the mill-annealed condition it has a guaranteed minimum room-temperature yield strength of 120,000 psi and can be increased to as much as 160,000 psi by solution treating and aging. This alloy may be used for high-pressure cryogenic vessels down to 320 F. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-89. Producer or source: RMI Company.

Sign in / Sign up

Export Citation Format

Share Document