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.

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

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

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

Synthesis of β-sialon/Ti(C, N) powders from mineral waste residue via carbothermal reduction nitridation

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31493-31502 ◽  
Author(s):  
Dexin Yang ◽  
Yan-gai Liu ◽  
Hao Ding ◽  
Jian Chen ◽  
Zhaohui Huang ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Reducing Agent ◽  
Low Grade ◽  
Composite Powders ◽  
Mineral Waste

β-Sialon/Ti(C, N) composite powders were synthesized via carbothermal reduction nitridation method with low-grade bauxite and ilmenite as starting materials and coke as the reducing agent.

In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

2015 ◽  
Vol 26 (4) ◽  
pp. 1200-1209 ◽  
Author(s):  
Özge Balcı ◽  
Duygu Ağaoğulları ◽  
Didem Ovalı ◽  
M. Lütfi Öveçoğlu ◽  
İsmail Duman
Keyword(s):  
Carbothermal Reduction ◽  
Raw Materials ◽  
In Situ Synthesis ◽  
Composite Powders

scholarly journals Influence of Laser Radiation on Optical Properties of Semiconductor Materials

2019 ◽  
Vol 20 (4) ◽  
pp. 384-390
Author(s):  
P.O. Gentsar ◽  
S.M. Levytskyi
Keyword(s):  
Optical Properties ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Semiconductor Materials ◽  
Surface Layers ◽  
Defective Structure ◽  
Before And After ◽  
532 Nm ◽  
Transmission And Reflection ◽  
Pulsed Laser Irradiation

In this paper, the transmission and reflection spectra of n-Si(100) single crystals are measured; n-GaAs(100); solid solutions of Ge1-хSiх (х = 0.85) in the range (0.2 - 1.7)·10-6 m before and after laser irradiation at the wavelength λ = 532 nm. It is established that the main mechanism of influence of pulsed laser irradiation on the optical properties of thin surface layers of the investigated crystals is structural gettering, that is, the absorption due to the presence of sections of semiconductors that have a defective structure and have the ability to actively absorb defects and points.

Solution-Based Synthesis of Ultra-Fine ZrB2 Powders and ZrB2-SiC Composite Powders

2010 ◽  
Vol 105-106 ◽  
pp. 213-217 ◽  
Author(s):  
Xiao Pan Che ◽  
Shi Zhen Zhu ◽  
Li Juan Yang ◽  
Qiang Xu
Keyword(s):  
Particle Size ◽  
Carbothermal Reduction ◽  
Fine Particle ◽  
Phenolic Resin ◽  
Ph Value ◽  
Raw Materials ◽  
Tetraethyl Orthosilicate ◽  
Composite Powders ◽  
Fine Particle Size ◽  
Precursor Powders

Ultra-fine ZrB2 powders and ZrB2-SiC composite powders were synthesized by solution-based method, using zirconium oxynitrate (ZrO(NO3)2•2H2O), boric acid (H3BO3), phenolic resin, and tetraethyl orthosilicate (TEOS) as raw materials, respectively. The zirconia sol with other precursor was formed via adjustment of the pH value. After drying, grinding and sieving, the precursor powders were obtained. Exposed to carbothermal reduction heat treatments (1300°C~1500°C, 0.5h, flowing argon), pure ZrB2 powders and ZrB2-SiC composite powders with fine particle size (~1μm) were synthesized.

Synthesis of ZrN–Si3N4 composite powders from zircon and quartz by carbothermal reduction and nitridation

2013 ◽  
Vol 246 ◽  
pp. 677-681 ◽  
Author(s):  
Li Yin ◽  
Youguo Xu ◽  
Zhaohui Huang ◽  
Yan-gai Liu ◽  
Minghao Fang ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Composite Powders

scholarly journals Synthesis of TiN-Si3N4 composites from rutile and quartz by carbothermal reduction nitridation

2012 ◽  
Vol 44 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Kai Chen ◽  
Zhaohui Huang ◽  
Minghao Fang ◽  
Yan-Gai Liu
Keyword(s):  
Carbothermal Reduction ◽  
Raw Materials ◽  
Average Particle Size ◽  
Equilibrium Phase ◽  
Phase Evolution ◽  
Equilibrium Phase Diagram ◽  
Nitrogen Pressure ◽  
Average Particle ◽  
Carbon Addition ◽  
Composite Powders

TiN-Si3N4 composite powders were prepared by carbothermal reduction nitridation using rutile and quartz as raw materials. The influence of temperature and carbon addition on the phase evolution and microstructure of the products were investigated. The equilibrium phase diagram of Si-C-N-O and Ti-C-N-O system at different temperatures under 0.2 MPa nitrogen pressure was drew. The results show that the optimum parameters for synthesizing TiN-Si3N4 by carbothermal reduction nitridation process are carbon addition of stoichiometric content, temperature of 1873 K for 4 h and nitrogen pressure of 0.2 MPa. The produced TiN-Si3N4 in this experiment exist in granular and hexagonal columnar shape, and the average particle size of the synthesized powders is 2 ~ 10 ?m.

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