曹玉霞.B4 C 含量对等离子喷涂 NiCoCrAlY / Al2 O3 -B4 C复合涂层力学性能的影响[J].表面技术,2015,44(8):20-24. CAO Yu-xia.Effect of B4C Content on the Mechanical Properties of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3-B4C Composite Coatings[J].Surface Technology,2015,44(8):20-24 |
B4 C 含量对等离子喷涂 NiCoCrAlY / Al2 O3 -B4 C复合涂层力学性能的影响 |
Effect of B4C Content on the Mechanical Properties of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3-B4C Composite Coatings |
投稿时间:2015-04-21 修订日期:2015-08-20 |
DOI:10.16490/j.cnki.issn.1001-3660.2015.08.004 |
中文关键词: NiCoCrAlY/ Al2O3-B4C 复合涂层 等离子喷涂 显微硬度 结合强度 |
英文关键词:NiCoCrAlY / Al2 O3 -B4 C composite coatings APS microhardness tensile strength |
基金项目:河北省自然科学基金项目(E2015105068);唐山市科技计划项目(14130286a);唐山学院材料科学与工程重点学科项目(TSC2013003) |
|
|
摘要点击次数: |
全文下载次数: |
中文摘要: |
目的 提高等离子喷涂 NiCoCrAlY/ Al2O3 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/ Al2O3 和 NiCoCrAlY/ B4C 复合粉体,通过等离子喷涂技术制备 NiCoCrAlY/ Al2O3-B4C 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 B4C 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 ~5 μm。 等离子喷涂 NiCoCrAlY/ Al2O3-B4C 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 B4C 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 B4C 质量分数达到 30% 时,涂层的显微硬度比未添加 B4C 时提高了 1. 4 倍,结合强度比未添加 B4C 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/ Al2O3 复合涂层中添加 B4C,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。 |
英文摘要: |
Objective To improve the tribological properties of NiCoCrAlY/ Al2O composite coating. Methods The NiCoCrAlY/ Al2O3 and NiCoCrAlY/ B4C 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 ~ 5 μm. 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. |
查看全文 查看/发表评论 下载PDF阅读器 |
关闭 |
|
|
|