共查询到17条相似文献,搜索用时 46 毫秒
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超音速火焰喷涂技术研究进展 总被引:1,自引:0,他引:1
介绍了一种超音速火焰喷涂技术的发展过程、工作原理和特点、涂层的应用以及未来的发展方向。该技术制备的涂层致密、氧化物含量极低,在耐磨、抗氧化、耐腐蚀和机械零件修复等领域得到了广泛的应用。 相似文献
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对在钢材表面采用的氧乙炔火焰喷涂这一新型吸热陶瓷材料的耐磨性能及耐磨机理进行了试验研究结果表明,该涂层具有较低的孔隙率、较高的硬度和抗压强度,以及良好的耐磨性。其磨损机理主要有塑性涂抹、磨粒磨损和疲劳剥落。 相似文献
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1 掉塑发生机理环氧聚酯粉末依靠静电吸附到工件的磷化膜层后 ,在固化烘箱中产生熔融、胶化、流平、固化四个过程。其中 ,熔融、胶化、流平三个过程中的粉末出现液体特征 ,会渗入磷化膜层的孔洞中 ,从而使粉末层与磷化膜层紧密结合。如果在熔融、胶化、流平三个过程中粉末层不能与磷化膜层紧密结合 ,那么 ,工件在受到很小外力作用下会出现塑层脱离钢板磷化膜层的现象。2 掉塑的形式掉塑的形式分为局部轻微掉塑与大面积掉塑两种。局部轻微掉塑发生后塑层只有少量脱离 ,未脱落部分用针轻挑塑层不会继续脱落 ;大面积掉塑表现为少量塑层脱落 ,… 相似文献
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试验研究静电粉末喷涂技术中影响沉积效率的主要因素,解决了快速换色的工艺方法。结果表明,尽管影响沉积效率的因素很多,但只要选择最佳的工艺参数和技术条件,就能获得满意的效果。 相似文献
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Nanostructured TiO2 is a most promising functional ceramic owing to its potential utilization in photocatalytical, optical and electrical applications. Nanostructured TiO2 coating was deposited through thermal spraying with liquid feedstock. Two types of crystalline structures were present in the synthesized TiO2 coating including anatase phase and rutile phase.The effect of spray flame conditions on the crystalline structure was investigated in order to control the crystalline structure of the coating. The results showed that spray distance, flame power and precursor concentration in the liquid feedstock significantly influenced phase constitutions and grain size in the coating. Anatase phase was formed at spray distance from 150 to 250mm, while rutile phase was evidently observed in the coating deposited at 100 mm. The results suggested that anatase phase was firstly formed in the coating, and rutile phase resulted from the transformation of the deposited anatase phase. The phase transformation from anatase to rutile occurred through the annealing effect of spraying flame. The control of the phase formation can be realized through flame condition and spray distance. 相似文献
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ZhiwenLI ChangsongLIU JihuaHUANG ShengYIN 《材料科学技术学报》2003,19(2):161-163
A simpler and more convenient method for producing wear-resistant, TiC-reinforced coatings were investigated in this study. It consists of the simultaneous synthesis and deposition of TiC-Fe materials by oxyacetylene flame spraying. Solid reagents bound together to form a single particle are injected into the flame stream where an in-situ reaction occurs. The reaction products are propelled onto a substrate to form a coating. Microstructural analyses reveal that TiC and Fe are the dominant phases in the coatings. The reaction between Ti and C happens step by step along with the reactive spray powder flight, and TiC-Fe materials were mainly synthesized where the spray distanceis 125~170 mm. The TiC-Fe coatings are composed of alternate TiC-rich and TiC-poor lamellae with different microhardness of 11.9~13.7 and 3.0~6.0 GPa, respectively. Submicron and round TiC particles are dispersed within a ductile metal matrix. The peculiar microstructure is thought to be responsible for its good wear resistance, which is better nearly five times than WC-reinforced cermet coatings obtained by traditional oxyacetylene flame spray. 相似文献