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High-speed synthesis of fullerences by using low-frequency induction thermal plasma with pulse-modulated mode.

使用脉冲调制模式的低频感应热等离子体高速合成富勒烯。

基本信息

批准号：
11555078
负责人：
SAKUTA Tadahiro
金额：
$ 8.77万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

(1) Synthesis of fullerenes using high-power induction thermal plasma and dependence of various parameters on the products. Fullerene synthesis were made using high-power induction thermal plasma and dependence of various parameters on the products was investigated. The parameters are as follows: (a) gas kind, (b) pressure, c input power, (d) power materials, (e) location for collection of the products. Through the investigation, the following conditions were found to be preferable for fullerene synthesis: (a) He as main ambient gas rather than Ar, (b) Lower pressure of 20kPa than 50 or 67 kPa, c Lower input power of 30kW than 50 or 70kW, (d) C+Si material power compared with C+Fe, C+Ni-Co and pure C, (e) long-distance location of 900mm from plasma torch rather than close location. Further investigation was made by numerical simulation of flow and temperature fields in a reaction chamber. This result indicates that use of He increases temperature gradient on the torch axis, which means the high cooling efficiency of gas. Also, it was found that low pressure increases axial flow velocity, which causes high cooling efficiency of gas.(2) Development of pulse-modulated induction thermal plasma torch and investigation of dynamic response of thermal plasma. A novel system was developed to sustain pulse-modulated induction thermal plasma with amplitude-modulated coil-current. This system has a MOSFET inverter power supply rated at a power of 50kW and a operating frequency of 450kHz. Dynamic response characteristics were investigated for Ar based induction thermal plasma with additional gases. This result indicates that C02 inclusion markedly lowers both operating region and dynamic response of pulse-modulated induction thermal plasma. This pulse-modulated induction thermal plasma is available for fullerene synthesis by high-speed cooling and heating.

(1)高功率感应热等离子体合成富勒烯及各种参数对产物的影响。利用高功率感应热等离子体合成富勒烯，研究了各种参数对产物的影响。参数如下：（a）气体种类，（B）压力，c输入功率，（d）功率材料，（e）收集产物的位置。通过研究，发现以下条件对于富勒烯合成是优选的：（a）He作为主要环境气体而不是Ar，（B）20 kPa的压力比50或67 kPa低，（c）30 kW的输入功率比50或70 kW低，（d）C+Si材料功率与C+Fe、C+Ni-Co和纯C相比，（e）距离等离子体炬900 mm的远距离位置，而不是近距离位置。通过对反应室内流场和温度场的数值模拟进行了进一步的研究。这一结果表明，He的使用增加了炬轴上的温度梯度，这意味着气体的高冷却效率。此外，还发现，低压力增加轴向流速，这导致气体的高冷却效率。(2)脉冲调制感应热等离子体炬的研制及热等离子体动态响应的研究。提出了一种利用调幅线圈电流维持脉冲调制感应热等离子体的新系统。该系统具有额定功率为50 kW和工作频率为450 kHz的MOSFET逆变器电源。研究了含附加气体的Ar基感应热等离子体的动态响应特性。这一结果表明，CO2夹杂物显着降低脉冲调制感应热等离子体的工作区域和动态响应。这种脉冲调制感应热等离子体可用于通过高速冷却和加热来合成富勒烯。