共查询到15条相似文献,搜索用时 203 毫秒
1.
2.
FeCrBSiNb粉芯丝材电弧喷涂的弧区动态行为 总被引:1,自引:0,他引:1
电弧喷涂粉芯丝材是由金属外皮包覆金属或非金属的复合粉末组成,喷涂过程中在弧区发生冶金反应并雾化成熔滴,大量熔滴沉积在基体表面最终形成涂层。粉芯丝材的电弧喷涂是一个高度动态的传热传质过程,采用高速摄像技术研究了喷涂过程中两根粉芯丝材交汇处的电弧、丝材熔化与熔滴形成等行为。另外,通过高速摄像试验分析了喷涂电流和电压对电弧形态及丝材熔化的影响规律。结果表明:喷涂时间歇出现燃弧、熄弧、再燃弧的循环变化;不同于实心丝材,粉芯丝材在阴阳极上的电弧都发散,这有利于丝材外皮和粉芯间的冶金反应;阴极丝材主要表现为抽吸作用下以细小熔滴或片状挤出物等形式形成熔滴,阳极丝材主要以片状液带的形式脱离并雾化成小熔滴。 相似文献
3.
4.
5.
6.
《机械制造文摘:焊接分册》2010,(5):46-47
金属喷涂工艺及设备
碳化硼对电弧喷涂涂层性能的影响/魏琪…//焊接学报.-2010,31(11):65-68 将碳化硼(B4C)陶瓷粉末和其它合金元素与304L不锈钢带轧制成粉芯丝材,采用电弧喷涂技术制备金属陶瓷复合涂层。研究了B4C在电弧喷涂中的应用。利用XRD,SEM对涂层的形貌、相组成和磨损表面进行了分析。 相似文献
7.
8.
将碳化硼(B4C)陶瓷粉末和其它合金元素与304L不锈钢带轧制成粉芯丝材,采用电弧喷涂技术制备金属陶瓷复合涂层.研究了B4C在电弧喷涂中的应用.利用XRD,SEM对涂层的形貌、相组成和磨损表面进行了分析.利用自行设计的高温磨粒磨损装置和高温冲蚀设备分别评价了B4C对涂层耐高温磨粒磨损性能和耐高温冲蚀性能的影响.结果表明,粉芯丝材喷涂工艺良好,B4C陶瓷与粉芯中其它组分反应,可以形成含Fe3B,CrB,FexN i23-xB6,Fe23(C,B)6,(Cr,Fe)7C3和Fe3C等硬质相的复合涂层,大幅度提高了涂层的硬度和耐磨耐冲蚀性能. 相似文献
9.
介绍了FeCrNi/CBN粉芯丝材的研制过程,采用高速电弧喷涂技术将所研制的FeCrNi/CBN粉芯丝材成功地在45钢基体上制备出FeCrNi/CBN复合涂层。对涂层的结合强度、硬度、抗热震性和耐磨损性能等进行了测试,利用扫描电镜,能谱仪等手段对涂层进行分析。研究表明,涂层的组织呈现出典型的层状结构特征;综合力学性能优异.具有较高的结合强度、高致密度、较好的耐热震性能和耐磨损性能。 相似文献
10.
介绍了FeCrNi/CBN粉芯丝材的研制过程,采用高速电弧喷涂技术将所研制的FeCrNi/CBN粉芯丝材成功地在45钢基体上制备出FeCrNi/CBN复合涂层。对涂层的结合强度、硬度、抗热震性和耐磨损性能等进行了测试,利用扫描电镜,能谱仪等手段对涂层进行分析。研究表明,涂层的组织呈现出典型的层状结构特征;综合力学性能优异,具有较高的结合强度、高致密度、较好的耐热震性能和耐磨损性能。 相似文献
11.
电弧喷涂丝材在我国的新进展 总被引:7,自引:1,他引:6
介绍了我国六种典型电弧喷涂丝材的新进展,提出电弧喷涂管状丝材的应用是热喷涂材料最大的进展之一。同时,提出电弧喷涂管状丝材在耐磨防腐方面的研究方向及应用前景。 相似文献
12.
Thermal spray processes such as plasma spraying and HVOF have gained markets due to a steady process of development of materials
and equipment. One disadvantage of thermal spray processes is that costs must be competitive compared to techniques such as
PTA and electroplating. In order to reduce costs, the more economical spray processes like conventional wire flame spraying,
as well as arc spraying, are becoming more popular. There are modern arc spray gun designs on the market that meet the requirements
of modern coating properties, for example aviation overhaul applications as well as the processing of cored wires. Nevertheless,
the physical basis of arc spraying is well known. The aim of the present investigation is to show how the influence of spray
velocity (not particle velocity) affects coating structure with respect to arc spray parameters. 相似文献
13.
14.
D. Sacriste N. Goubot J. Dhers M. Ducos A. Vardelle 《Journal of Thermal Spray Technology》2001,10(2):352-358
The high power plasma torch (PlazJet) can be used to spray refractory ceramics with high spray rates and deposition efficiency.
It can provide dense and hard coating with high bond strengths. When manufacturing thermal barrier coatings, the PlazJet gun
is well adapted to spraying the ceramic top coat but not the MCrAIY materials that are used as bond coat. Arc spraying can
compete with plasma spraying for metallic coatings since cored wires can be used to spray alloys and composites. In addition,
the high production rate of arc spraying enables a significant decrease in coating cost. This paper discusses the performances
of the PlazJet gun, and a twin-wire are spray system, and compares the properties and cost of MCrAIY coatings made with these
two processes. For arc spraying, the use of air or nitrogen as atomizing gas is also investigated. 相似文献