表面技术
錶麵技術
표면기술
SURFACE TECHNOLOGY
2015年
8期
20-24
,共5页
NiCoCrAlY/Al2 O3-B4 C复合涂层%等离子喷涂%显微硬度%结合强度
NiCoCrAlY/Al2 O3-B4 C複閤塗層%等離子噴塗%顯微硬度%結閤彊度
NiCoCrAlY/Al2 O3-B4 C복합도층%등리자분도%현미경도%결합강도
NiCoCrAlY/Al2 O3-B4 C composite coatings%APS%microhardness%tensile strength
目的：提高等离子喷涂NiCoCrAlY/Al2 O3复合涂层的摩擦性能。方法采用离心喷雾造粒、化学冶金包覆和固相合金化技术制备NiCoCrAlY/Al2 O3和NiCoCrAlY/B4 C复合粉体,通过等离子喷涂技术制备NiCoCrAlY/Al2 O3-B4 C复合涂层。对涂层的显微结构、结合强度和显微硬度进行表征,研究B4 C含量对等离子喷涂NiCoCrAlY/Al2O3-B4C复合涂层力学性能的影响。结果 Al2O3和B4C颗粒包覆了致密的NiCoCrAlY合金层,包覆层厚约3~5μm。等离子喷涂NiCoCrAlY/Al2 O3-B4 C复合涂层呈典型的层状结构,涂层结构致密,各层间结合良好。随着B4 C含量的增加,复合涂层的显微硬度逐渐增大,结合强度逐渐降低,当B4 C质量分数达到30%时,涂层的显微硬度比未添加B4 C时提高了1.4倍,结合强度比未添加B4 C时降低了26%。涂层在拉伸试验中发生了典型的脆性断裂,断裂位置发生在涂层内部。结论向等离子喷涂NiCoCrAlY/Al2 O3复合涂层中添加B4 C,可显著提高涂层的显微硬度,但会使涂层的结合强度有一定程度降低。
目的：提高等離子噴塗NiCoCrAlY/Al2 O3複閤塗層的摩抆性能。方法採用離心噴霧造粒、化學冶金包覆和固相閤金化技術製備NiCoCrAlY/Al2 O3和NiCoCrAlY/B4 C複閤粉體,通過等離子噴塗技術製備NiCoCrAlY/Al2 O3-B4 C複閤塗層。對塗層的顯微結構、結閤彊度和顯微硬度進行錶徵,研究B4 C含量對等離子噴塗NiCoCrAlY/Al2O3-B4C複閤塗層力學性能的影響。結果 Al2O3和B4C顆粒包覆瞭緻密的NiCoCrAlY閤金層,包覆層厚約3~5μm。等離子噴塗NiCoCrAlY/Al2 O3-B4 C複閤塗層呈典型的層狀結構,塗層結構緻密,各層間結閤良好。隨著B4 C含量的增加,複閤塗層的顯微硬度逐漸增大,結閤彊度逐漸降低,噹B4 C質量分數達到30%時,塗層的顯微硬度比未添加B4 C時提高瞭1.4倍,結閤彊度比未添加B4 C時降低瞭26%。塗層在拉伸試驗中髮生瞭典型的脆性斷裂,斷裂位置髮生在塗層內部。結論嚮等離子噴塗NiCoCrAlY/Al2 O3複閤塗層中添加B4 C,可顯著提高塗層的顯微硬度,但會使塗層的結閤彊度有一定程度降低。
목적：제고등리자분도NiCoCrAlY/Al2 O3복합도층적마찰성능。방법채용리심분무조립、화학야금포복화고상합금화기술제비NiCoCrAlY/Al2 O3화NiCoCrAlY/B4 C복합분체,통과등리자분도기술제비NiCoCrAlY/Al2 O3-B4 C복합도층。대도층적현미결구、결합강도화현미경도진행표정,연구B4 C함량대등리자분도NiCoCrAlY/Al2O3-B4C복합도층역학성능적영향。결과 Al2O3화B4C과립포복료치밀적NiCoCrAlY합금층,포복층후약3~5μm。등리자분도NiCoCrAlY/Al2 O3-B4 C복합도층정전형적층상결구,도층결구치밀,각층간결합량호。수착B4 C함량적증가,복합도층적현미경도축점증대,결합강도축점강저,당B4 C질량분수체도30%시,도층적현미경도비미첨가B4 C시제고료1.4배,결합강도비미첨가B4 C시강저료26%。도층재랍신시험중발생료전형적취성단렬,단렬위치발생재도층내부。결론향등리자분도NiCoCrAlY/Al2 O3복합도층중첨가B4 C,가현저제고도층적현미경도,단회사도층적결합강도유일정정도강저。
ABSTRACT:Objective To improve the tribological properties of NiCoCrAlY/Al2 O composite coating. Methods The NiCoCrAlY/Al2 O3 and NiCoCrAlY/B4 C composite powders were prepared by the technology of spray granulation, chemical and metallurgical coating and solid state alloying. The NiCoCrAlY/Al2 O3-B4 C composite coatings were prepared by atmospheric plasma-spray tech-nology. The microstructure, tensile strength and microhardness were studied in order to investigate the effect of B4 C content on the mechanical properties of atmospheric plasma-sprayed NiCoCrAlY/Al2 O3-B4 C composite coatings. Results The Al2 O3 and B4 C were coated by NiCoCrAlY alloy, respectively, and the thickness of NiCoCrAlY alloy was 3~5μm. The composite coatings consisted of elongated lamellae and they integrated with each other very well. The microhardness of the coatings increased and the tensile strength of the coatings decreased with the increasing B4 C content. The microhardness of the coatings was 1. 4 times higher than that of the coatings without B4 C and the tensile strength of the coatings decreased by 26% as compared with that of the coatings without B4 C, when the B4C content was 30%. Typical brittle fracture occurred in the coatings in the tensile test and the fracture locations were inside the coatings. Conclusion The addition of B4 C into the atmospheric plasma-sprayed NiCoCrAlY/Al2 O3 could improve the microhardness of the coatings, but it also destroyed the tensile strength of the coatings.
