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5.6.3 (3) Basic types of ternary phase diagrams课程教案、知识点、字幕

下面我们来学习第3类三元相图

看相图下方

我们知道这是生成一个固相分解的二元化合物的三元系统相图

图中三个无变量点

根据重心规则

P点对应的副三角形为ACS

P点位于△ACS的交叉位

所以是单转熔点

L将A转熔

生成 S+C

and form S + C

E点对应的副三角形为△BCS

且位于重心位

所以E是低共熔点

此点液相L

同时析出 S+C+B

我们着重看R点

包围R点的初晶区为ASB

但是连接ASB并不能构成一个三角形

而是一条直线

那么R点是什么点呢

R点为过渡点

L+A+B生成S

实质是

A和B发生固相反应生成S

L起介质作用

这个相图中三个无变量点

画出了两个副三角形

印证了我们前面讲过的无变量点的个数

大于等于副三角形的个数

我们再来看线

通过切线规则

确定PR线为转熔线

L+A生成S

知道了点线的含义

现在我们分析1点的析晶路程

点1位于A的初晶区

所以首先连接A1并延长

液相将不断地析出晶体A

直到D点

D点位于转熔线上

所以这个时候发生转融

将A转融掉生成S

液相点移动到N点时

固相点移动到S点

说明此时晶体A消失

所以转融不再发生

液相点将穿过S的初晶区

发生穿晶现象

当液相点到F点时

开始析出晶体C和S

走到E点

同时析出BCS

固相点移动到和系统组成点重合

析晶结束

下面我们来看具有一个一致熔融三元化合物的三元系统相图

这个相图的特点是S的组成点在其初晶区内

系统可划分为三个分系统

这个相图比较简单

我们就不再详述了

接下来

我们看具有不一致熔融三元化合物的三元系统相图

相图中三元化合物S的组成点位于其初晶区以外

因而是一个不一致熔化合物

这个相图希望大家在课后加以分析

按照我们分析生成不一致熔融二元化合物相图的方法

同学们在划分副三角形后

根据重心规则判断无变量点的性质

用连线规则和重心规则在界线上标示单箭头和双箭头

最后按照前面我们讲过的方法分析析晶路线

我们学习了六类三元系统基本类型相图

现在总结一下分析复杂相图的主要步

判断化合物的性质

根据化合物组成点是否落在其初晶区内

判断化合物性质属一致熔或不一致熔

另外

化合物组成点如果落在浓度三角形内

为三元化合物

若在三条边上就为二元化合物

划分副三角形

根据无变量划分副三角形

如果5个无变量点

最多画出5个副三角形

应用连线规则判断界线上温度下降的方向

第4步

应用切线规则判断界线的性质

注意一条界线上可能既有共熔性质又有转熔性质

五根据重心规则确定无变量点的性质

最后

分析冷却析晶过程

要牢记固相点

液相点

系统组成点

始终保持三点一线

到此为止

我们把三元系统相图的基本类型给大家讲解完了

为了能够应用专业相图

我们大家课后一定要认真复习

掌握分析三元相图的重要规则及步骤

这次课就到这里

同学们再见

Fundamentals of Inorganic Materials Science课程列表:

1 Introduction

-Introduction

-introduction

-Test for chapter 1

2 Crystal Imperfection

-2.1 Type of defect

--2.1 Types of point defects

--2.1 Types of point defects

-2.2.1 The expression methods of point defects

--2.2.1 The expression methods of point defects

--2.2.1 The expression methods of point defects

-2.2.2 The rules for writing of defect reaction equation

--2.2.2 The rules for writing of defect reaction equation

--2.2.2 The rules for writing of defect reaction equation

-2.3 Calculation of thermal defect concentration

--2.3 Calculation of thermal defect concentration

--2.3 Calculation of thermal defect concentration

-2.4 Non-stoichiometric compounds

--2.4 Non-stoichiometric compounds

--2.4 Non-stoichiometric compounds

-Homework for chapter 2

-Test for chapter 2

3 Solid solution

-3.1 The classification of solid solutions

--3.1 The classification of solid solutions

--3.1 The classification of solid solutions

-3.2 Substitutional solid solution

--3.2 Substitutional solid solution

--3.2 Substitutional solid solution

-3.3 Interstitial solid solution

--3.3 Interstitial solid solution

--3.3 Interstitial solid solution

-3.4 The research method of solid solutions

--3.4 The research method of solid solutions

--3.4 The research method of solid solutions

-3.5 Questions for crystal imperfection and solid solution

--Questions for crystal imperfection and solid solution

-Homework for chapter 3

-Test for chapter 3

4 Melt and glass

-4.1 Melt structure

--4.1 Melt structure

--4.1 Melt structure

-4.2 The properties of the melt

--4.2.1 The properties of the melt_viscosity

--4.2.2 The properties of the melt_surface tension

--4.2 The properties of the melt

-4.3 The characteristics of glass

--4.3 The characteristics of glass

--4.3 The characteristics of glass

-4.4 The formation of glass

--4.4.1 The formation of glass_kinetics conditions

--4.4.2 The formation of glass_crystal chemical conditions

--4.4 The formation of glass

-4.5 The structure of glass

--4.5 The structure of glass

--4.5 The structure of glass

-4.6 The typical glass

--4.6 The typical glass

--4.6 The typical glass

-4.7 Questions for melt and glass

--Questions for melt and glass

-Test for chapter 4

5 Phase equilibrium

-5.1 Phase equilibrium in silicate systems

--5.1 Phase equilibrium in silicate system

--5.1 Phase equilibrium in silicate system

-5.2 One-component system phase diagram

--5.2 One-component system phase diagram

--5.2 One-component system phase diagram

-5.3 Applications of one-component diagrams

--5.3 Applications of one-component diagrams

--5.3 Applications of one-component diagrams

-5.4 Binary diagrams

--5.4.1 Binary diagram with eutectic point

--5.4.2 Binary system with a congruent melting compound and one with an incongruent melting compound

--5.4.3 Other five types of phase diagrams of binary systems

--5.4 Binary diagrams

-5.5 Applications of binary phase diagrams

--5.5 Applications of binary phase diagrams

--5.5 Applications of binary phase diagrams

-5.6 Ternary diagrams

--5.6.1 Representation of ternary system composition

--5.6.1 Representation of ternary system composition

--5.6.2 Three-dimensional state diagram and plane projection diagram of a simple ternary system

--5.6.2 Three-dimensional state diagram and plane projection diagram of a simple ternary system

--5.6.3 (1) Basic types of ternary phase diagrams

--5.6.3 (2) Basic types of ternary phase diagrams

--5.6.3 (3) Basic types of ternary phase diagrams

--5.6.3 Basic types of ternary phase diagrams

-5.7 Applications of ternary phase diagrams

--5.7 Applications of ternary phase diagrams

--5.7 Applications of ternary phase diagrams

-5.8 Research methods of phase equilibrium

--5.8 Research methods of phase equilibrium

--5.8 Research methods of phase equilibrium

-5.9 Questions for phase equilibria

--Questions for phase equilibria

-Homework for chaper 5

-Test for chapter 5

6 Diffusion

-6.1 Overview of diffusion

--6.1 Overview of diffusion

--6.1 Overview of diffusion

-6.2 The kinetic equations of diffusion

--6.2 The kinetic equations of diffusion

--6.2 The kinetic equations of diffusion

-6.3 The thermodynamic equation of diffusion

--6.3 The thermodynamic equation of diffusion

--6.3 The thermodynamic equation of diffusion

-6.4 Diffusion mechanisms and diffusion coefficient

--6.4 Diffusion mechanisms and diffusion coefficient

--6.4 Diffusion mechanisms and diffusion coefficient

-6.5 Diffusion in solid

--6.5 Diffusion in solid

--6.5 Diffusion in solid

-6.6 Factors affecting diffusion

--6.6 Factors affecting diffusion

--6.6 Factors affecting diffusion

-6.7 Questions for diffusion

--Questions for diffusion

-Homework for chaper 6

-Test for chapter 6

7 Solid state reactions

-7.1 Overview of solid state reactions

--7.1 Overview of solid state reactions

--7.1 Overview of solid state reactions

-7.2 Kinetic equation of solid state reaction

--7.2 Kinetic equation of solid state reaction

-7.3 Factors affecting the solid state reaction

--7.3 Factors affecting the solid state reaction

--7.3 Factors affecting the solid state reaction

-Homeword for chapter 7

8 Phase transformation

-8.1 The categories of phase transformation

--8.1 The categories of phase transformation

--8.1 The categories of phase transformation

-8.2 Crystallization

--8.2.1 Crystallization thermodynamics

--8.2.2 Crystallization kinetics

--8.2 Crystallization

-8.3 Phase Separation of glass

--8.3 Phase separation of glass

--8.3 Phase separation of glass

-8.4 Questions for phase transformation

--Questions for phase transformation

-Test for chapter 8

9 Sintering

-9.1 Overview of sintering

--9.1 Overview of sintering

--9.1 Overview of sintering

-9.2 The driving forces and models of sintering

--9.2 The driving forces and models of sintering

--9.2 The driving forces and models of sintering

-9.3 Solid state sintering

--9.3.1 Evaporation-Condensation mass transfer

--9.3.2 Diffusion mass transfer

--9.3 Solid state sintering

-9.4 Liquid phase sintering

--9.4.1 Flow mass transfer

--9.4.2 Solution-Precipitation mass transfer

--9.4 Liquid phase sintering

-9.5 Grain growth and secondary recrystallization

--9.5.1 Grain growth

--9.5.2 Secondary recrystallization

--9.5 Grain growth and secondary recrystallization

-9.6 Factors affecting sintering

--9.6 Factors affecting sintering

--9.6 Factors affecting sintering

-9.7 Questions for sintering

--Questions for sintering

-Homework for chapter 9

-Test for chapter 9

5.6.3 (3) Basic types of ternary phase diagrams笔记与讨论

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