scholarly journals Preparationof Silicon Nitride With High Thermal Conductivity and High Flexural Strength by Two-Step Sintering Method Using Ybh2-Mgo as Sintering Additive

2021 ◽  
pp. 705
Author(s):  
CHEN Huanbei ◽  
LI Shishuai ◽  
WANG Weide ◽  
YAO Dongxu ◽  
ZUO Kaihui ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
High Thermal Conductivity ◽  
Sintering Additive ◽  
Sintering Method

Improved Thermal Conductivity and Mechanical Property of PTFE Reinforced with Al2O3

NANO ◽  
2019 ◽  
Vol 14 (05) ◽  
pp. 1950064 ◽  
Author(s):  
Min Chao ◽  
Changjuan Guo ◽  
Ailing Feng ◽  
Zhengyong Huang ◽  
Qingli Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Mechanical Property ◽  
Dielectric Properties ◽  
Thermal Conductance ◽  
High Thermal Conductivity ◽  
Mass Content ◽  
Thermal Stabilities ◽  
Cold Pressing ◽  
Sintering Method

To achieve polymer-based composites for electronic packaging with high thermal conductivity, Al2O3 nanoplatelets were introduced into polytetrafluoroethylene (PTFE) matrix via a cold pressing and sintering method. The effect of mass content of the Al2O3 platelets on the morphology, mechanical properties, thermal conductivity and dielectric properties of the composites was investigated. The results revealed that the Al2O3/PTFE nanocomposites exhibited higher thermal conductivities, better thermal stabilities, enhanced mechanical properties with considerable dielectric properties. The largest thermal conductivity of the Al2O3/PTFE nanocomposites filled with 25[Formula: see text]wt.% Al2O3 platelets was 0.461[Formula: see text]W[Formula: see text]m[Formula: see text][Formula: see text]K[Formula: see text], increased by 85% compared with that of pure PTFE. The improved thermal conductivity of Al2O3/PTFE can be attributed to the formation of effective thermal conductance network within the PTFE matrix due to the interconnectivity of Al2O3 platelets.

Mechanical and Thermal Properties of Silicon Nitride Hot Pressed with Adding Rare-Earth Oxides

2005 ◽  
Vol 486-487 ◽  
pp. 181-184 ◽  
Author(s):  
Dae Ho Choi ◽  
Byung Kyu Moon ◽  
Rak Joo Sung ◽  
Seung Ho Kim ◽  
Koichi Niihara
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
Grain Growth ◽  
Rare Earth Oxides ◽  
Lattice Oxygen ◽  
Mechanical And Thermal Properties ◽  
Si3n4 Ceramics

Mechanical and thermal properties of Si3N4 ceramics with various rare-earth oxides (La2O3, CeO2, Lu2O3, Dy2O3, Sm2O3, Nd2O3, Yb2O3, and RuO2) were investigated. Flexural strength of silicon nitride with addition of 5vol% Nd2O3, CeO2, Dy2O3, and Sm2O3 showed higher value than that of silicon nitride with Lu2O3 and La2O3 added because they form denser microstructure and smaller elongated grain. Thermal conductivity of silicon nitride with an addition of 5vol% RuO2 was more enhanced than that of silicon nitride added with Nd2O3, Sm2O3, and Dy2O3 because the addition of RuO2 depressed grain growth. It is also associated with lattice oxygen governing thermal conductivity of Si3N4 when added rare-earth oxides.

Fracture Resistance Behavior of High-Thermal-Conductivity Silicon Nitride Ceramics

2013 ◽  
Vol 11 (5) ◽  
pp. 872-882 ◽  
Author(s):  
You Zhou ◽  
Tatsuki Ohji ◽  
Hideki Hyuga ◽  
Yu-ichi Yoshizawa ◽  
Norimitsu Murayama ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Nitride ◽  
Fracture Resistance ◽  
High Thermal Conductivity ◽  
Nitride Ceramics

Microstructural Evolution and Mechanical Properties in Yb2O3–Fluxed Silicon Nitride Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 1172-1174
Author(s):  
Gang Feng Guo ◽  
Xiao Zhan Yang ◽  
Jian Bao Li ◽  
Hong Lin ◽  
Long Liang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
Microstructural Evolution ◽  
Intergranular Fracture ◽  
Fracture Mode ◽  
Transgranular Fracture ◽  
Sintering Additive ◽  
Nitride Ceramics

Silicon nitride ceramics were fabricated with Yb2O3 as the sintering additive. The effects of the amount of Yb2O3 on the microstructure and the mechanical properties such as the flexural strength and the fracture toughness were investigated. Almost fully densified Si3N4 was obtained when only 4 wt% Yb2O3 was added. Both the flexural strength and the fracture toughness increased steadily with the Yb2O3 content. The transgranular fracture mode was observed in the specimen containing 4 wt% Yb2O3, however, the intergranular fracture mode was observed in the specimen containing 10 wt% Yb2O3.

Effect of Different Composite Additives on Thermal Conductivity of Corundum Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 500-504 ◽  
Author(s):  
Xing Yong Gu ◽  
Shao Ling Wu ◽  
Ai Hua Zhang ◽  
Ting Luo ◽  
Yun Xia Chen
Keyword(s):  
Thermal Conductivity ◽  
Flexural Strength ◽  
Sintering Temperature ◽  
Alumina Ceramic ◽  
Inorganic Materials ◽  
High Thermal Conductivity ◽  
Alumina Ceramics ◽  
Composite Ceramics ◽  
Subsequent Reaction ◽  
X Ray

To improve the thermal conductivity of alumina ceramics, different inorganic materials such as AlN, BN, Si3N4 and SiC which own high thermal conductivity were integrated with 96% alumina ceramic. The effect of addition of AlN, BN, Si3N4 and SiC on water absorption, flexural strength and thermal conductivity of the as-prepared alumina-based composite ceramics were investigated. Field emission scanning electron microscopy (FESEM) and X-ray diffractometer (XRD) were employed to characterize the microstructure and phase compositions of the composites. The results showed that sintering temperature of 96% alumina ceramic matrixes were improved in varying degree due to adding AlN, BN, SiC and Si3N4. A small quantity of Al6Si2O13 crystals were formed in the case of adding Si3N4 and SiC, which is due to the oxidation of Si3N4 and SiC into SiO2 in the air and the subsequent reaction with alumina. At appropriate firing temperature, the flexural strength of the composites with the addition of AlN is the best and higher than corundum matrixes. Meanwhile, the thermal conductivity of the composites with AlN has 110% improvement. It is obvious that AlN with high thermal conductivity is suitable for improving the thermal conductivity of corundum ceramics.

Sign in / Sign up

Export Citation Format

Share Document