Scholarlink

Improvement in mechanical and wear properties of a material surface can enhance the service life of a component and thus have significant savings in energy and other resources. Electroless Ni–B coatings deposited using sodium borohydride as a reducing agent are well-known to alter the mechanical and tribological characteristics of material surface favorable for various industrial applications (Vitry et al. in Surf Coat Technol 206:1879–1885, 2011 [1]; Sudagar et al. in J Alloys Compd 571:83–204, 2013 [2]; Mukhopadhyay et al. in Surf Coat Technol 321:464–476, 2017 [3]). In the present investigation, to analyze beneficial advancement in the properties of electroless binary Ni–B alloy coating within a smaller area, a 2 kW CW fiber laser is utilized for the laser treatment of coatings’ surface. Variable laser power levels (100, 150, 200, and 250 W) are selected for this laser surface treatment in order to analyze the effects on coating's structural, mechanical, and tribological behavior and compare them with the as-deposited Ni–B coatings. All as-deposited and laser-treated coatings are thoroughly characterized using several techniques, namely, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), microhardness tester, scratch tester, and linear reciprocating sliding wear tester to study effects of the laser intensity on the coatings’ properties. Ni–B coatings reveal short-range order characteristics and nodular top surface morphology in their as-deposited state. Significant changes in these characteristics are observed with the variation in laser power, which governs the degree of crystallization, and types of development of new phases within the coatings’ matrices. Formation of intermetallic phases, such as nickel borides (Ni3B and Ni2B), iron borides (Fe2B, Fe8B, and Fe7B), and Fe0.64Ni0.36 within coatings’ matrices as a function of laser power governs the properties of coatings. Among all, samples treated at 150 W evolved superior in terms of hardness and mechanical and tribological properties due to the precipitation strengthening achieved with the intermetallic phases developed within the crystalline coatings’ matrices. Beyond 150 W, either degradation in coatings characteristics owing to the coalescence and coarsening of intermetallic phases within matrix happens or a large-scale melting is observed.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Evaluation of Microstructural, Mechanical, and Tribological Properties of Laser-Treated Electroless Ni–B Coatings

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Vaibhav Nemane,
  • Mahesh Malviy,
  • Satyajit Chatterjee

摘要

Improvement in mechanical and wear properties of a material surface can enhance the service life of a component and thus have significant savings in energy and other resources. Electroless Ni–B coatings deposited using sodium borohydride as a reducing agent are well-known to alter the mechanical and tribological characteristics of material surface favorable for various industrial applications (Vitry et al. in Surf Coat Technol 206:1879–1885, 2011 [1]; Sudagar et al. in J Alloys Compd 571:83–204, 2013 [2]; Mukhopadhyay et al. in Surf Coat Technol 321:464–476, 2017 [3]). In the present investigation, to analyze beneficial advancement in the properties of electroless binary Ni–B alloy coating within a smaller area, a 2 kW CW fiber laser is utilized for the laser treatment of coatings’ surface. Variable laser power levels (100, 150, 200, and 250 W) are selected for this laser surface treatment in order to analyze the effects on coating's structural, mechanical, and tribological behavior and compare them with the as-deposited Ni–B coatings. All as-deposited and laser-treated coatings are thoroughly characterized using several techniques, namely, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), microhardness tester, scratch tester, and linear reciprocating sliding wear tester to study effects of the laser intensity on the coatings’ properties. Ni–B coatings reveal short-range order characteristics and nodular top surface morphology in their as-deposited state. Significant changes in these characteristics are observed with the variation in laser power, which governs the degree of crystallization, and types of development of new phases within the coatings’ matrices. Formation of intermetallic phases, such as nickel borides (Ni3B and Ni2B), iron borides (Fe2B, Fe8B, and Fe7B), and Fe0.64Ni0.36 within coatings’ matrices as a function of laser power governs the properties of coatings. Among all, samples treated at 150 W evolved superior in terms of hardness and mechanical and tribological properties due to the precipitation strengthening achieved with the intermetallic phases developed within the crystalline coatings’ matrices. Beyond 150 W, either degradation in coatings characteristics owing to the coalescence and coarsening of intermetallic phases within matrix happens or a large-scale melting is observed.