scholarly journals Effects of carbon source type and dosage on the synthesis of Al2O3–AlN composite powders by the carbothermal reduction–nitridation method

2018 ◽  
Vol 126 (2) ◽  
pp. 79-86 ◽  
Author(s):  
Jilin HU ◽  
Qizhong HUANG ◽  
Xin YANG ◽  
Xiuying TIAN ◽  
Hongxia PENG ◽  
...  
Keyword(s):  
Carbon Source ◽  
Carbothermal Reduction ◽  
Composite Powders ◽  
Source Type

Combustion synthesis of C/MgAl 2 O 4 composite powders using magnesium oxalate as carbon source

2018 ◽  
Vol 16 (3) ◽  
pp. 1253-1263 ◽  
Author(s):  
Lihua Lv ◽  
Guoqing Xiao ◽  
Donghai Ding ◽  
Yun Ren ◽  
Shoulei Yang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Combustion Synthesis ◽  
Composite Powders ◽  
Magnesium Oxalate

In Situ Synthesis of ZrB2–SiC Composite Powders by Carbothermal Reduction Method

2018 ◽  
pp. 101-107
Author(s):  
Bingying Xie ◽  
Jincheng Yu ◽  
Yujun Zhang ◽  
Hongyu Gong ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Reduction Method ◽  
In Situ Synthesis ◽  
Composite Powders ◽  
Carbothermal Reduction Method

Sintering of Commercial B4C with Synthesized B4C Additions

2008 ◽  
Vol 591-593 ◽  
pp. 588-592
Author(s):  
Rosa Maria da Rocha ◽  
Jonas S. Gutierres ◽  
Francisco Cristóvão Lourenço de Melo
Keyword(s):  
Thermal Stability ◽  
Carbon Source ◽  
Carbon Black ◽  
Boron Carbide ◽  
Carbothermal Reduction ◽  
Pressureless Sintering ◽  
High Chemical ◽  
Powder Mixtures ◽  
B4c Powder ◽  
Sintered Materials

Boron Carbide is a ceramic material of technological application due to its extreme hardness and high chemical and thermal stability. The effect of synthesized boron carbide addition on pressureless sintering and hot-pressing of a commercial B4C was investigated. B4C synthesized by carbothermal reduction using carbon black as carbon source was mixtured in 10, 30 and 50 wt% to a commercial B4C. Powder mixtures were compacted into pellets and sintered by pressureless sintering at 2050 °C/30min Samples were compared to a pure commercial B4C and characterization results have not showed great differences. Relative densities of as-sintered materials exceed 93% of theoretical for all compositions and microhardness Hv of ∼ 32 GPa was obtained.

Synthesis of TiC–TiB2 composite powders via carbothermal reduction and its reaction mechanism

2017 ◽  
Vol 116 (7) ◽  
pp. 409-417 ◽  
Author(s):  
J. L. Hu ◽  
H. X. Peng ◽  
S. M. Wang ◽  
W. M. Guo ◽  
C. Y. Hu ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Carbothermal Reduction ◽  
Composite Powders

Effect of MgO Coating on the Hydration Resistance of MgO-CaO Clinkers

2011 ◽  
Vol 695 ◽  
pp. 324-327 ◽  
Author(s):  
Hong Feng Yin ◽  
Yan Long Ma ◽  
Jun Yang
Keyword(s):  
Carbon Source ◽  
Carbon Black ◽  
Reaction Temperature ◽  
Carbothermal Reduction ◽  
Processing Parameters ◽  
Holding Time ◽  
Deposition Mechanism ◽  
The Poor ◽  
Hydration Resistance ◽  
Prolonged Holding

To overcome the disadvantage of MgO-CaO refractories, as the poor hydration resistance, MgO coating on the MgO-CaO clinker was fabricated by carbothermal reduction MgO with carbon as reduction agent and then the oxidation of Mg vapor. Effect of processing parameters (such as carbon source, reaction temperature and holding time) on the hydration resistance of MgO-CaO clinkers were investigated by hydration resistance test and SEM. The results indicated that the hydration resistance of treated MgO-CaO clinkers was improved when carbon black was used as reduction agent due to easy reaction with MgO than the graphite and coke. The high reaction temperature among 1450~1600°C and prolonged holding time within 4 h resulted in improvement of the hydration resistance of treated MgO-CaO clinker. Deposition mechanism of MgO coating on the MgO-CaO clinker was discussed.

Features of Formation of Composite Nanopowders Based on Al2O3 and AlN

2012 ◽  
Vol 1371 ◽  
Author(s):  
M. Vlasova ◽  
P. A. Márquez Aguilar ◽  
M. Kakazey ◽  
V. Stetsenko ◽  
A. Bykov ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Carbothermal Reduction ◽  
Complex Surface ◽  
Composite Powders ◽  
Defective Structure ◽  
Technological Processes

ABSTRACTTwo technological processes of synthesis of nanopowders containing Al2O3, AlN, and AlON have been investigated. It has been established that AlN nanoparticles formed on the base of ablation products (Al and N2) during laser irradiation of AlN targets are coated with AlON films of different composition and have a complex surface defective structure. In composite powders obtained by carbothermal reduction of Al2O3, along with AlN and AlON, initial oxide Al2O3 is present, which indicates the incompleteness of the process.

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