The Synthesis of TiC Powders by Carbothermal Reduction Method in Vacuum

2014 ◽  
Vol 1064 ◽  
pp. 62-65
Author(s):  
Xue Tan Ren ◽  
Yan Chun Liu ◽  
Shui Hui Chen ◽  
Lai Guang Hou ◽  
Guo Long Wang ◽  
...  
Keyword(s):  
Carbon Black ◽  
Crystalline Phase ◽  
Carbothermal Reduction ◽  
Single Phase ◽  
Reduction Method ◽  
Raw Materials ◽  
Molar Ratio ◽  
Carbothermal Reduction Method ◽  
System Pressure

The TiC powders were synthesized by carbothermal reduction of TiO2in vacuum using the titania and carbon black as raw materials. The molar ratio of C to TiO2was 3:1. The crystalline phase, microstructure and morphology of the obtained samples were investigated by XRD and SEM. The results show that single-phase and well-crystallized TiC powders were obtained at 1300°C for 1h when the system pressure was 20 Pa. The particle morphologies are composed of fine grains about 200 nm.

Preparation of β-Sialon from Fly Ash by Carbothermal Reduction-Nitridation Reaction

2008 ◽  
Vol 368-372 ◽  
pp. 910-912 ◽  
Author(s):  
Jun Tong Huang ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
Zhao Hui Huang
Keyword(s):  
Fly Ash ◽  
Carbon Black ◽  
Carbon Content ◽  
Carbothermal Reduction ◽  
Single Phase ◽  
Raw Materials ◽  
Synthesis Mechanism ◽  
Nitridation Reaction

Single phase Sialon was synthesized successfully from fly ash by carbothermal reductionnitridation reaction in this paper. The effects of synthesizing temperature (1200°C, 1300°C, 1400°C and 1450°C) and carbon content (stoichiometric content, exceeding 10%, 50% and 100%) on the final production were studied by XRD and SEM. Synthesis mechanism of β-Sialon was also analysized. The results indicated that single phase β-Sialon with z=3 was obtained using fly ash as raw materials and carbon black of stoichiometric content as reducer by carbothermal reduction- nitridation reaction in flow nitrogen at 1450°C for 3h. Temperature and content of carbon had significant effect on the synthesis of β-Sialon.

Reaction Mechanism of LiFePO4/C Cathode Materials Synthesized by Carbothermal Reduction Method

2010 ◽  
Vol 178 ◽  
pp. 248-253 ◽  
Author(s):  
Li Min Gao ◽  
Guang Chuan Liang ◽  
Li Wang ◽  
Xiao Ke Zhi ◽  
Xiao Fei Jie
Keyword(s):  
Carbothermal Reduction ◽  
Reduction Method ◽  
Intermediate Phase ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Reducing Atmosphere ◽  
Carbothermal Reduction Method ◽  
Lower Temperature

LiFePO4/C powders were synthesized by carbothermal reduction method using Li2CO3 (A.R), FePO4 (A.R) and glucose as raw materials. In this paper, the carbothermal reaction courses were characterized by Thermo-gravimetric (TG)/Differential Thermal Analysis (DTA), X-ray diffraction (XRD) and Fourier transform infrared (FTIR). It was found that the different synthesis temperatures and the different reducing atmosphere in systems could lead to different reactions, resulting in different final products and a direct impact on material performance. At around 350 °C LiFePO4 is directly formed without intermediate phase. In lower temperature of 400-500 °C, the sample included a certain amount of Li3PO4 and Fe2O3 impurity phases. When calcination temperature rose to 550 °C, the sample could be pure LiFePO4 phase.

Preparation of TiB2 Ultrafine Powders by Carbothermal Reduction

2016 ◽  
Vol 697 ◽  
pp. 58-61
Author(s):  
Jin Cheng Yu ◽  
Li Ma ◽  
Yu Jun Zhang ◽  
Hong Yu Gong ◽  
Li Wei Zhou
Keyword(s):  
Carbon Black ◽  
Carbothermal Reduction ◽  
Reduction Method ◽  
Raw Materials ◽  
Structural Evolution ◽  
Holding Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Boron Source ◽  
Different Content

TiO2, B2O3, H3BO3, B4C and carbon black were used as the raw materials to prepare TiB2 powders by carbothermal reduction method. The influence of different content of carbon black (13.6~14.8 wt%) on products was discussed. The effects of different boron sources and holding time (10~50 min) on the microstructure of TiB2 powders were also investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to study the phase composition and structural evolution of the powder. The final results showed that hexagonal TiB2 crystal grain could be successfully synthesized without impurities when heated at 1700°C for 30 min in Ar atmosphere with the addition of 14.1 wt% carbon black. Submicrometric TiB2 powders range from 0.5 to 1.0 μm could be obtained when B4C was used as the boron source. The increase in holding time contributed to the grain growth and completion of chemical reactions, but could also result in oversintering.

Synthesis of Aluminum Oxynitride Powder by Carbothermal Reduction Method

2010 ◽  
Vol 105-106 ◽  
pp. 791-793
Author(s):  
Ting Yan Tian ◽  
Hong Bing Du ◽  
Feng Sun ◽  
Hua Wei Jiang
Keyword(s):  
Activated Carbon ◽  
Carbothermal Reduction ◽  
Reduction Method ◽  
Raw Materials ◽  
Aluminum Oxynitride ◽  
Carbon Impurity ◽  
Sintering Additive ◽  
Carbothermal Reduction Method ◽  
Step Procedure ◽  
Hot Press Sintering

γ-aluminum oxynitride (γ-ALON) powder was prepared by carbothermal reduction method using γ-Al2O3 and activated carbon as raw materials. Effects of activated carbon content, synthesizing temperature, holding time and carbon impurity on ALON powder were studied. It was found a ‘two-step’ procedure, first sintering at about 1550°C-1650°C then at about 1750°C-1850°C, was effective to prepare high-purity ALON powder. The removal of carbon impurity was crucial for the preparation of ALON powder, which effectively improved the purity of ALON powder. The prepared powder was characterized by XRD and SEM, which indicated that pure ALON powder prepared by a ‘two-step’ procedure had well-developed crystalline and homogenous granularity. Transparent ALON ceramics were prepared by hot-press sintering at 1850~1900°C for up to 2~4h using ALON powder and some sintering additive, the transmission of sample with thickness of 1mm was 81% at infrared wave.

Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Materials by Microwave-Assisted Carbothermal Reduction Method

2010 ◽  
Vol 156-157 ◽  
pp. 1199-1202
Author(s):  
Bo Quan Jiang ◽  
Shu Fen Hu ◽  
Zhi Qiang Ye
Keyword(s):  
Electrochemical Performance ◽  
Cathode Materials ◽  
Carbothermal Reduction ◽  
Reduction Method ◽  
Heating Time ◽  
Lithium Vanadium Phosphate ◽  
Molar Ratio ◽  
Microwave Assisted ◽  
Carbothermal Reduction Method ◽  
Charge Discharge

The lithium vanadium phosphate (Li3V2(PO4)3) cathode materials were synthesized by microwave- assisted carbothermal reduction method. The effects of microwave heating time and Li/V molar ratio on the structure and electrochemical performance of the prepared samples were investigated. The results show that the perfect crystal growth and good electrochemical performance ( first charge / discharge specific capacity of 160.8 mAh•g-1/151.3 mAh•g-1 and discharge decay rate of 7.90% after 30 cycles ) of the Li3V2(PO4)3 were obtained under the optimal conditions of heating time 11 min and Li/V molar ratio 3.05:2.0. The voltage values appeared at the oxidation and reduction peaks of the cyclic voltammetry curves were proved to be basically consistent with those appeared at the charge / discharge curves. The lithium ion diffusion coefficient was determined to be 2.320 ×10-9 cm2•s-1 by electrochemical impedance spectroscopy and mathematical models derived from simulative equivalent circuit.

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

scholarly journals Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1811 ◽  
Author(s):  
Yuan Zeng ◽  
Feng Liang ◽  
Jianghao Liu ◽  
Jun Zhang ◽  
Haijun Zhang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Carbothermal Reduction ◽  
Reduction Method ◽  
Low Cost ◽  
Highly Efficient ◽  
Carbothermal Reduction Method ◽  
Low Temperature Preparation ◽  
Phase Pure ◽  
Low Efficiency ◽  
Reduced Temperature

To address the various shortcomings of a high material cost, energy-intensive temperature conditions and ultra-low efficiency of the conventional boro/carbothermal reduction method for the industrial preparation of ZrB2-SiC powders, a novel molten-salt and microwave-modified boro/carbothermal reduction method (MSM-BCTR) was developed to synthesize ZrB2-SiC powders. As a result, phase pure ZrB2-SiC powders can be obtained by firing low-cost zircon (ZrSiO4), amorphous carbon (C), and boron carbide (B4C) at a reduced temperature of 1200 °C for only 20 min. Such processing conditions are remarkably milder than not only that required for conventional boro/carbothermal reduction method to prepare phase pure ZrB2 or ZrB2-SiC powders (firing temperature of above 1500 °C and dwelling time of at least several hours), but also that even with costly active metals (e.g., Mg and Al). More importantly, the as-obtained ZrB2 particles had a single crystalline nature and well-defined plate-like morphology, which is believed to be favorable for enhancing the mechanical properties, especially toughness of their bulk counterpart. The achievement of a highly-efficient preparation of such high-quality ZrB2-SiC powders at a reduced temperature should be mainly attributed to the specific molten-salt and microwave-modified boro/carbothermal reduction method.

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