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低碳钢液相等离子体碳氮硼共渗的组织及性能

时间:2017-12-06 21:31来源:毕业论文
论文采用正交设计,通过在不同的共渗时间、加载电压、占空比以及电解液配比的条件下,对低碳钢进行液相等离子体碳氮硼的共渗处理
摘要液相等离子体电解渗透技术是一种在开放的大气环境中,利用等离子体电解对材料进行表面处理的新兴技术。它具有工作时间短、生产效率高、整体工件受热轻微以及处理后可实现自淬火等技术特点。本毕业论文采用正交设计,通过在不同的共渗时间、加载电压、占空比以及电解液配比的条件下,对低碳钢进行液相等离子体碳氮硼的共渗处理。
研究结果表明:共渗时间、电压、占空比增加,都会增大渗层的厚度。随着共渗时间增加,渗层的厚度不断增大。当加载电压为300V,占空比大于等于70%时,不但会使硬度下降,还会使试样损坏。电压和占空比是影响渗层硬度值的关键因素,250V和80%的占空比是获得最佳硬度值的理论和实践好条件。水和甲酰胺的比例,不是影响渗层的硬度和厚度的关键因素。但是,增强电解液的导电性,渗层的厚度和最大硬度将会明显的升高。理论上,获得综合力学性能最好的共渗条件为25min、250V、70%的占空比和溶液配比为85%甲酰胺,15%水,2g四硼酸钠,8gKCl的电解液。
关键词: 等离子体;碳氮硼共渗;渗透层16257
毕业设计说明书(论文)外文摘要
Title  The microstructure and performance of low carbon
steel prepared by plasma electrolytic saturation of borocarbonitriding                                         
Abstract
The plasma electrolytic saturation is a kind of emerging materials’ surface treatment by using electrolyzed plasma in the open air condition. Saving of time, high production efficiency, overall heated slightly and self quenching after treatment is its advantages. In this paper,the orthogonal design is used to arrange the experiment of low carbon steel’ plasma electrolytic saturation of borocarbonitriding in diffrient infiltration time, load voltage, duty cycle and the solution proportioning. 源自六;维,论/文.网*加7位QQ324`9114 www.lwfree.cn
The results shows that, along with the increase of the infiltration time,  load voltage and duty cycle, the infiltrated layer gets thicker. But if the load voltage gets 300V and at the same time ,the duty cycle is equal to or greater than 70%, the tset piece could be damaged and its hardness would be lower. The voltage and duty cycle are the key factors of hardness, and 250V of voltage and 80% of duty cycle are good conditions of getting the highest hardness both in theory and practice. The proportion of water and formamide has no big impact on thickness and hardness of the infiltrated layer. However, enhancing the conductivity of electrolyte by doubling inorganic salt , the layer will be harder and thicker. In theory, putting the sample in the solution consist 85% formamide, 15% water, Na2B4O7 of 2g and KCl of 8g at 250V of load voltage and 80%  of duty cycle for 25min, the infiltrated layer will get the excellent integrated mechanical properties.
Key words: plasma, borocarbonitriding, infiltrated layer
 目次

1  引言    1
1.1  液相等离子体碳氮共渗    1
1.1.1  基本工艺流程    2
1.1.2  基本原理    2
1.1.3  技术优势和缺陷    3
1.2  液相等离子体碳氮硼的共渗    3
1.3  论文研究的意义    4
2  实验方法    5
2.1  实验材料    5
2.2  实验仪器和设备    5
2.2.1  共渗装置    5
2.3  试样的正交设计    6
2.4  工艺流程    7
2.5  反应过程    8
3  结果与分析    9 低碳钢液相等离子体碳氮硼共渗的组织及性能:http://www.lwfree.cn/cailiao/20171206/17527.html
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