摘要三元层状陶瓷Ti3SiC2作为MAX相的杰出代表，由于其优异的性能已经受到众多材料研究者的足够重视，众多的研究表明，Ti3SiC2良好的导电性能，良好的导热性，良好的抗高温氧化性，高的弹性模量，高的热稳定性，耐酸碱腐蚀性，良好的抗热震性，良好的可加工性等，使其具有广泛的应用，可以用作高温结构材料。因此对于Ti3SiC2的研究具有显而易见的意义。

本文主要通过采用Ti、Si、C单质直接烧结制备Ti3SiC2，以及Ti、Si、TiC粉末混合烧结制备Ti3SiC2两种主要制备方法来制备Ti3SiC2。并通过XRD，扫描电子显微镜分析等手段确定不同成分和温度对材料微观组织的影响，并以此研究如何获高纯度的 Ti3SiC2。68044

通过实验，得出了以下结论：

（1） 通过改变烧结温度、保温时间和原料组成，制备出了纯度较高的Ti3SiC2粉末。

（2） 确定了合理的制备工艺原则，即：

当实验的烧结温度一定时，延长保温时间，可以提高产物的纯度；

当实验的保温时间一定时，在许可范围（不使产物发生分解）内，提高烧结温度，可以提高产物纯度。

（3） 通过扫描电镜观察表明，Ti3SiC2的微观组织为片层状结构。

毕业论文关键词  Ti3SiC2；热压烧结；X射线衍射分析；扫描电镜分析

毕业设计说明书（论文）外文摘要

Title    The Research of Pressureless Sintering about    Ti3SiC2 a ternary layered material                 

Abstract

Ti3SiC2, a ternary layered material, which is a very good representative of MAX phase, has attracted a lot of attention of material researchers, because of its excellent attributes. As many researches show, Ti3SiC2 has good electrical conductivity and thermal conductivity, good high oxidation resistance, high Young’s modulus, high temperature chemical stability, acid and alkali resistance, good thermal shock, easily processing and so on. These make Ti3SiC2 extensively use, such as high temperature construction material. So the research of Ti3SiC2 is meaningful.

In the article, we make Ti3SiC2 by two ways, one is by fritting powder of Ti, Si and graphite, the other one is by fritting powder of Ti, Si and TiC. And then we detect the samples by XRD and SEM to research how to get the high purity Ti3SiC2.

Conclusions as follows:

(1) By changing the sintering temperature, thermal insulation time and the composition of the material, making high quality Ti3SiC2 powder.

(2) Get the suitable principle about making the Ti3SiC2 powder:

When the sintering temperature is invariable, increasing the thermal insulation time can improve the quality of  Ti3SiC2 powder;

When the thermal insulation time is invariable, increasing the sintering temperature can improve the quality of  Ti3SiC2 powder.

(3) The results of the SEM shows that Ti3SiC2 is a ternary layered material.

Keywords  Ti3SiC2;hot pressing; XRD; SEM

目  次

1  绪论 1

1.1 引言 1

1.2  Ti3SiC2的结构 1

1.3  Ti3SiC2试样的制备 2

1.3.1  块体Ti3SiC2与粉末Ti3SiC2 2

1.3.2  气相合成法 3

1.3.3  固相合成法 3