关键词：分散 纳米SiC颗粒 纳米ZrO2颗粒 MoSi2 小4号黑体
小4号楷体 指导老师签名：
小4号黑体
14
2.2英文摘要
3号Arial Black Studies on the uniformly dispersing of nanoparticles in
小四号Times New Roman ZrO2/SiC-MoSi2 Ceramic Nanocomposite
Student name : Liu Xing Class: 020J121 4号Arial Black Supervisor: ×××
小4号Times New Roman Abstract:When preparing ceramic nanocomposites,the most importance is that
nanoparticles are uniformly in sub-micron matrix. Otherwise the nanoparticles will grows excessively in the course of sintering, which induce the toughening function lost. The main reason of nanoparticles growing excessively is reuniting of nanoparticles. Therefore, the key to prepare excellent ceramic nanocomposites is that nanopartiles are dispersed uniformly in matrix.
In this article, the dispersing of ZrO2 and SiC nanometer particles in the preparation process of ZrO2/SiC-MoSi2 composites were investigated with multiphase suspensions mixed. SiC and ZrO2 nanoparticles were dispersed with water and the alcohol as the dispersion medium, PEG, PAA - NH 4 and PMAA - NH4 as the dispersing agent. Simultaneously the effect of the surface pretreatment on the dispersive influence of SiC nanoparticles were studied. The Zeta electric potential test and the subsidence experiment indicated that the dispersibility of SiC nanoparticles can be effectively improved after calcinated at 550℃ for two hours in air. The dispersing effect of nanoparticles using water were better that using alcohol.The dispersion of ZrO2 is PAA-NH4 , the best effect of dispersing of sic is at the dispersion medium of PMAA-NH4 .The best effect of dispersions was in the content of 0.2wt%. SEM indicated that uniformly dispersed ZrO2/SiC-MoSi2 nanocomposite powder could be obtained by the best dispersible craf .
Keyword：dispersion SiC nanoparticles ZrO2 nanoparticles MoSi2 小4号Arial Black Signature of Supervisor:
小4号Times New Roman 固定行距22pt 15
3 论文目录
论文目录格式如下:
小4号宋体，缩1格 小4号Arial Black 小3号黑体，居中 目 录 小3号宋体, 缩2格 1 XXXXX 1.1 XXXXXXXXXXXXXXXXXXX ······································ (XX) 1.1.1 XXXXXXXXXXXXXXXXXXX ······································ (XX) 1.2 XXXXXXXXXXXXXXXXXXX ······································ (XX)
2 XXXXX 小3号宋体, 缩2格 小4号宋体，缩1格 2.1 XXXXXXXXXXXXXXXXXXX ······································ (XX) 2.1.1 XXXXXXXXXXXXXXXXXXX ······································ (XX) 2.2 XXXXXXXXXXXXXXXXXXX ······································ (XX)
参考文献 ········································································· 小3号宋体 ·
·························································································· (XX)
致 谢 ·········································································· (XX) 附录 A ···························································· (XX)
注: 三级目录可视情况确定是否上目录。
16
4页面设置
页眉1.0cm 南昌航空大学士学位论文 上边距2.5cm 左边距2.0cm 装订线1.0cm 25.0cm X15.5cm 右边距2.5cm 下边距2.5cm 注：页眉（可有可无）
页脚1.0cm 页码 5 正文层次格式及其有关内容规范 5.1标题
3号宋体加黑，居中 XXXXXXXXXXXXXXXXXXXX 5.2 正文层次格式 【示例】
小3号宋体加黑，居左 小4号宋体, 固定行间距22pt 1 加工电流检测方法的选择 1.1高频群脉冲电化学加工电流信号描述
电化学加工中用脉冲电源取代直流电源而出现的脉冲电化学加工，由于极大改善了阴阳极极间间隙流场特性，从而使电化学加工的精度得以显著提高向精密加工领域迈进。高频群脉冲电化学加工是基于加工微小型工件而提出的，电源群脉冲形式如图所示。
17
4号宋体加黑，居左 小4号宋体, 固定行间距22pt 1.3电流检测原理 电流检测有很多方法：如电流表直接测量法、电流- 电压转换法（ 包括取样电阻法、反馈电阻法）、电流- 频率转换法、电流< 磁场转换法、电流互感器法等。电流表直接测量法对于串入电流表不方便或没有适当量程的电流表的情况，是行不通的。在电流< 电压转换法中取样电阻法比较适合于测量较大的电流，而反馈电阻法比较适合测量小电流，但是同电流表直接测量法一样，需要截断电流回路，对原电路影响较大，特别在量程范围较大时，要经常更换分流器。电流< 频率转换法可用于各种恒流源场合，对微电流（ 例如光电流）检测尤为合适。 1.3.2 影响加工电流的因素及本电路设计的难点 小4号宋体加黑，居左 本电路拟应用于本实验室自行研制的高频群脉冲电化学加工机床的电源上。本电源的群脉冲产生电路（及直流逆变电路）采用绝缘双极晶体管。
注:凡没有标明字体的，与论文内容一致。
小4号宋体, 固定行间距22pt 18
相关推荐：
loading