Densification kinetics of boron carbide in hot pressing

1987 ◽  
Vol 26 (11) ◽  
pp. 881-884 ◽  
Author(s):  
M. S. Koval'chenko ◽  
Yu. G. Tkachenko ◽  
L. F. Ochkas ◽  
D. Z. Yurchenko ◽  
V. B. Vinokurov
Keyword(s):  
Boron Carbide ◽  
Hot Pressing ◽  
Kinetics Of

Fabrication of Carbon Nanotube Reinforced Boron Carbide Composite by Hot-Pressing Following Extrusion Molding

2014 ◽  
Vol 616 ◽  
pp. 27-31 ◽  
Author(s):  
Tomohiro Kobayashi ◽  
Katsumi Yoshida ◽  
Toyohiko Yano
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Boron Carbide ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Bending Strength ◽  
Extrusion Direction ◽  
Sem Observation

The CNT/B4C composite with Al2O3 additive was fabricated by hot-pressing following extrusion molding of a CNT/B4C paste, and mechanical properties of the obtained composite were investigated. Many CNTs in the composite aligned along the extrusion direction from SEM observation. 3-points bending strength of the composite was slightly lower than that of the monolithic B4C. Elastic modulus and Vickers hardness of the composite drastically decreased with CNT addition. Fracture toughness of the composite was higher than that of the monolithic B4C.

Densification of boron carbide powder during hot pressing

1979 ◽  
Vol 18 (5) ◽  
pp. 312-316
Author(s):  
I. T. Ostapenko ◽  
V. V. Slezov ◽  
R. V. Tarasov ◽  
N. F. Kartsev ◽  
V. P. Podtykan
Keyword(s):  
Boron Carbide ◽  
Hot Pressing ◽  
Carbide Powder

Hot Pressing of Boron Carbide Using Metallic Carbides as Additives

2009 ◽  
pp. 135-141
Author(s):  
S.L. Pedro Augusto de Cosentino ◽  
Célio A. Costa ◽  
José Brant de Campos ◽  
Roberto Ribeiro de Avillez
Keyword(s):  
Boron Carbide ◽  
Hot Pressing

Thermodynamics kinetics of boron carbide under gamma irradiation dose

2019 ◽  
Vol 33 (09) ◽  
pp. 1950073 ◽  
Author(s):  
Matlab Mirzayev ◽  
Ertugrul Demir ◽  
Khagani Mammadov ◽  
Ravan Mehdiyeva ◽  
Sakin Jabarov ◽  
...  
Keyword(s):  
Activation Energy ◽  
Boron Carbide ◽  
Gamma Irradiation ◽  
Irradiation Time ◽  
Energy Levels ◽  
Initial State ◽  
Scanning Calorimetry ◽  
Gas Atmosphere ◽  
Quantitative Changes ◽  
Kinetics Of

In this paper, high purity boron carbide samples were irradiated by [Formula: see text]Co gamma radioisotope source (0.27 Gy/s dose rate) with 50, 100, 150 and 200 irradiation hours at room-temperature. The unirradiated and irradiated boron carbide samples were heated from 30[Formula: see text]C to 1000[Formula: see text]C at a heating rate of 5[Formula: see text]C/min under the argon gas atmosphere of flow rate 20 ml/min. Thermogravimetric (TG) and Differential Scanning Calorimetry (DSC) were carried out in order to understand the thermodynamic kinetics of boron carbide samples. The weight kinetics, activation energy and specific heat capacity of the unirradiated and irradiated boron carbide samples were examined in two parts, T [Formula: see text] 650[Formula: see text]C and T [Formula: see text] 650[Formula: see text]C, according to the temperature. The dynamic of quantitative changes in both ranges is different depending on the irradiation time. While the phase transition of unirradiated boron carbide samples occurs at 902[Formula: see text]C, this value shifts upto 940[Formula: see text]C in irradiated samples depending on the irradiation time. The activation energy of the unirradiated boron carbide samples decreased from 214 to 46 J/mol in the result of 200[Formula: see text]h gamma irradiation. The reduction of the activation energy after the irradiation compared to the initial state shows that the dielectric properties of the irradiated boron carbide samples have been improved. After the gamma irradiation, two energy barrier states depending on the absorption dose of samples were formed in the irradiated samples. The first and second energy barriers occurred in 0.56–0.80 and 0.23–0.36 eV energy intervals, respectively. The existence of two energy levels in the irradiated boron carbide indicates that the point defects are at deep levels, close to the valence band.

Kinetics of densification during hot-pressing of aluminium nitride

1981 ◽  
Vol 16 (11) ◽  
pp. 3093-3098 ◽  
Author(s):  
J. -P. Lecompte ◽  
J. Jarrige ◽  
J. Mexmain ◽  
R. J. Brook ◽  
F. L. Riley
Keyword(s):  
Hot Pressing ◽  
Aluminium Nitride ◽  
Kinetics Of

Hot-Pressing Kinetics and Densification Mechanisms of Boron Carbide

2015 ◽  
Vol 98 (5) ◽  
pp. 1400-1406 ◽  
Author(s):  
Xianwu Du ◽  
Zhixiao Zhang ◽  
Yang Wang ◽  
Jilin Wang ◽  
Weimin Wang ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Hot Pressing

Densification kinetics of sandwich-type reinforced materials in hot pressing

1972 ◽  
Vol 11 (1) ◽  
pp. 22-27
Author(s):  
D. M. Karpinos ◽  
L. I. Tuchinskii ◽  
V. Ya. Fefer
Keyword(s):  
Hot Pressing ◽  
Sandwich Type ◽  
Kinetics Of ◽  
Reinforced Materials
Sign in / Sign up

Export Citation Format

Share Document