目录
摘要...........................................................................................................................I Abstract......................................................................................................................II
第一章绪论 (1)
1.1本文研究的目的及意义 (1)
1.2激光熔覆技术 (2)
1.2.1激光熔覆技术简介 (2)
1.2.2激光熔覆技术的特点 (3)
1.2.3激光熔覆技术的的发展与应用 (3)
1.2.4激光熔覆材料 (5)
1.3碳化铬-镍基复合涂层的国内外研究现状 (6)
1.3.1热喷涂技术制备碳化铬-镍基复合涂层 (6)
1.3.2激光熔覆技术制备碳化铬-镍基复合涂层 (7)
1.4本文研究的主要内容 (8)
第二章机械合金化粉体表征 (10)
2.1机械合金化（MA，Mechanical Alloying） (10)
2.1.1机械合金化法简介 (10)
2.1.2机械合金化的反应机理 (10)
2.1.3机械合金化过程的主要影响因素 (11)
2.2实验材料 (12)
2.3实验设备 (12)
2.4实验工艺 (13)
2.5实验结果与讨论 (13)
2.5.1机械合金化粉末SEM分析 (13)
2.5.2X射线衍射分析 (14)
2.5.3晶粒尺寸的分析 (15)
2.6本章小结 (16)
第三章激光熔覆涂层的制备及其性能表征 (17)
3.1实验材料 (17)
IV
3.1.1基体材料 (17)
3.1.2熔覆材料 (18)
3.2激光熔覆涂层的制备 (18)
3.2.1实验设备 (18)
3.2.2激光熔覆工艺 (18)
3.3激光熔覆涂层的组织及性能表征 (20)
3.3.1熔覆层显微组织及物相组成 (20)
3.3.2熔覆层的显微硬度 (21)
3.3.3熔覆层的耐磨性 (21)
3.3.4熔覆层的耐蚀性 (21)
3.4本章小结 (22)
第四章激光熔覆涂层的组织特征 (23)
4.1激光熔覆涂层的物相分析 (23)
4.2激光熔覆涂层的显微组织分析 (25)
4.2.1单道激光熔覆层微观组织分析 (25)
4.2.2多道激光熔覆层微观组织分析 (29)
4.3激光熔覆涂层的陶瓷相分析 (33)
4.4本章小结 (37)
第五章激光熔覆涂层的摩擦学分析 (38)
5.1显微硬度分析 (38)
5.2耐磨性分析 (41)
5.2.1摩擦系数分析 (42)
5.2.2磨损失重分析 (44)
5.2.3磨损形貌分析 (45)
5.3耐蚀性分析 (49)
5.4本章小结 (53)
第六章结论及展望 (55)
6.1结论 (55)
6.2展望 (56)
参考文献 (57)
攻读硕士期间发表的论文 (61)
致谢 (62)
V
Contents
Abstract(Chinese)........................................................................................................I Abstract(English).......................................................................................................II
Chapter1Introduction (1)
1.1The purpose and worth of this study (1)
1.2Laser cladding technology (2)
1.2.1Introduction of Laser cladding technology (2)
1.2.2Characteristic of Laser cladding technology (3)
1.2.3Development and application of Laser cladding technology (3)
1.2.4Laser cladding material (5)
1.3The research status of chromium carbide-Ni-based Composite coatings (6)
1.3.1The process chromium carbide reinforced Ni-base composite
coatings by thermal spraying technology (6)
1.3.2The process chromium carbide reinforced Ni-base composite
coatings by laser cladding (7)
1.4The main research of this dissertation (8)
Chapter2Characterizations of the MA powder (10)
2.1Mechanical Alloying (10)
2.1.1Introduction of mechanical Alloying (10)
2.1.2The reaction mechanism of mechanical Alloying (10)
2.1.3Factors influencing of mechanical Alloying (11)
2.2Experiment materials (12)
2.3Laboratory equipmen (12)
2.4Experiment process (13)
2.5The results and discuss of experimenta (13)
2.5.1SEM analysis of MA powder (13)
2.5.2XRD analysis (14)
2.5.3Analysis of grain size (15)
2.6Summary (16)
VI
Chapter3The process and characterizations of laser cladding coatings (17)
3.1Experiment material (17)
3.1.1Substrate material (17)
3.1.2Cladding material (18)
3.2Process of laser cladding coatings (18)
3.2.1Laboratory equipment (18)
3.2.2Process of laser cladding (18)
3.3The microstructure and performance characterizations of laser cladding
coatings (20)
3.3.1The microstructure and phase constituent of laser cladding coatings.20
3.3.2The microhardness of laser cladding coatings (21)
3.3.3The wear resistance of laser cladding coatings (21)
3.3.4The corrosion resistance of laser cladding coatings (21)
3.4Summary (22)
Chapter4Microstructure of laser cladding coatings (23)
4.1Phase constituent analysis of laser cladding coatings (23)
4.2Microstructure analysis of laser cladding coatings (25)
4.2.1Microstructure analysis of single pass laser cladding coatings (25)
4.2.2Microstructure analysis of multichannel laser cladding coatings (29)
4.3Ceramic analysis of laser cladding coatings (33)
4.4Summary (37)
Chapter5Tribology analysis of laser cladding coatings (38)
5.1Microhardness analysis (38)
5.2Wear resistance analysis (41)
5.2.1Friction coefficient analysi (42)
5.2.2Wear weightlessness analysis (44)
5.2.3Wear morphology analysis (45)
5.3Corrosion resistance analysis (49)
5.4Summary (53)
Chapter6Conclusion and prospect (55)
6.1Conclusion (55)
6.2Prospect (56)
VII
References (57)
Papers published in the period of https://www.doczj.com/doc/239842668.html,cation (61)
Acknowledgement (62)
VIII