Effect of rare-earth oxide addition on the thermal conductivity of sintered aluminium nitride

1992 ◽  
Vol 11 (22) ◽  
pp. 1508-1510 ◽  
Author(s):  
K. Watari ◽  
A. Tsuzuki ◽  
Y. Torii
Keyword(s):  
Thermal Conductivity ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Aluminium Nitride ◽  
Oxide Addition

scholarly journals Effects of rare earth oxide addition on NdFeB magnets.

1987 ◽  
Vol 11 (2) ◽  
pp. 235-238 ◽  
Author(s):  
K. Ohashi ◽  
T. Yokoyama ◽  
Y. Tawara
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Ndfeb Magnets ◽  
Oxide Addition

The effect of rare-earth oxide addition on the hot-pressing of magnesium silicon nitride

2002 ◽  
Vol 22 (5) ◽  
pp. 777-783 ◽  
Author(s):  
Shukiko Tanaka ◽  
Kiyoshi Itatani ◽  
Hiroshi Uchida ◽  
Mamoru Aizawa ◽  
Ian J Davies ◽  
...  
Keyword(s):  
Rare Earth ◽  
Silicon Nitride ◽  
Hot Pressing ◽  
Rare Earth Oxide ◽  
Oxide Addition

Fabrication and Microstructure of Electrically Conductive AlN with High Thermal Conductivity

2011 ◽  
Vol 484 ◽  
pp. 57-60
Author(s):  
Takafumi Kusunose ◽  
Tohru Sekino ◽  
Koiichi Niihara
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Rare Earth ◽  
Sintering Temperature ◽  
Rare Earth Oxide ◽  
High Thermal Conductivity ◽  
Boundary Phase ◽  
Sudden Increase ◽  
Electrically Conductive ◽  
Electrical Conductivities

The electrically conductive AlN with high thermal conductivity were successfully fabricated by sintering AlN with a composite additive of 1wt.% Y2O3 and 4wt.% CeO2 in carbon-reduced atmosphere at over 1600 °C. The sudden increase in electrical conductivity is thought to be caused by transition of grain boundary phase from rare-earth oxide to rare-earth oxycarbide. Their electrical conductivities and thermal conductivities increased with increasing sintering temperature. Additionally, sintering temperature influenced the resultant microstructures.

Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide

2003 ◽  
Vol 18 (8) ◽  
pp. 1854-1862 ◽  
Author(s):  
You Zhou ◽  
Kiyoshi Hirao ◽  
Yukihiko Yamauchi ◽  
Shuzo Kanzaki
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Rare Earth ◽  
Liquid Phase ◽  
Point Defects ◽  
Rare Earth Oxide ◽  
Low Oxygen ◽  
Sic Ceramics ◽  
Sintered Silicon ◽  
Thermal Conductivities

SiC ceramics were prepared from a β–SiC powder doped with two different sintering additives—a mixture of La2O3and Y2O3and a mixture of Al2O3and Y2O3—by hot pressing and annealing. Their microstructures, phase compositions, lattice oxygen contents, and thermal conductivities were evaluated. The SiC doped with rare-earth oxides attained thermal conductivities in excess of 200 W/(m K); however, the SiC doped with additives containing alumina had thermal conductivities lower than 71 W/(m K). The high thermal conductivity of the rare-earth-oxide-doped SiC was attributed to the low oxygen content in SiC lattice, high SiC–SiC contiguity, and lack of β– to α–SiC polytypic transformation. The low thermal conductivity of the alumina-doped SiC was attributed to the point defects resulting from the dissolution of Al2O3into SiC lattice and the occurrence of polytypic transformation.

scholarly journals Effects of Rare Earth Oxide Addition on the Sintering of Mullite

1991 ◽  
Vol 99 (1149) ◽  
pp. 351-356 ◽  
Author(s):  
Takashi MITAMURA ◽  
Hidehiko KOBAYASHI ◽  
Noboru ISHIBASHI ◽  
Tokuji AKIBA
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Oxide Addition

Oxidation Behavior and Mechanical Property of Si3N4 Ceramics with Rare Earth Oxide Addition

2007 ◽  
Vol 336-338 ◽  
pp. 2478-2480
Author(s):  
Xu Guang Tong ◽  
Jian Bao Li ◽  
Hong Lin ◽  
Xiao Zhan Yang ◽  
Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Oxidation Behavior ◽  
Rare Earth Oxide ◽  
Oxidation Products ◽  
Oxidation Test ◽  
Oxide Addition ◽  
Nitride Ceramics ◽  
Before And After ◽  
Si3n4 Ceramics

The effects of rare earth oxides (Lu2O3 and La2O3) on the property, microstructure and oxidation behavior of hot-pressing sintered Si3N4 ceramics were investigated. The silicon nitride ceramics with Lu2O3 and La2O3 as addition have been fabricated by hot-pressed at 1800°C for 1h under a pressure of 25MPa. Oxidation test was carried out at 1400°C in air for 100 hours. Mechanical properties, SEM and XRD were measured before and after oxidation. The results showed that Si3N4 ceramics doped Lu2O3 had good microstructure and mechanical properties than those doped La2O3. Oxidation test showed a parabolic weight gain with oxidation time at 1400°C in air and the oxidation products of the ceramics were SiO2, Re2Si2O7 and Re2SiO5 confirmed by XRD and EDS. The rate-controlling step was the diffusion of ion. The samples doped Lu2O3 showed superior oxidation resistance to those doped La2O3.

Effects of Rare Earth Oxide Addition on NdFeB Magnets

1988 ◽  
Vol 3 (2) ◽  
pp. 145-151 ◽  
Author(s):  
K. Ohashi ◽  
T. Yokoyama ◽  
Y. Tawara
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxide ◽  
Ndfeb Magnets ◽  
Oxide Addition
Sign in / Sign up

Export Citation Format

Share Document