Showing papers on "Nickel boride published in 1991"
TL;DR: In this article, a nickel boride coating with chromium has been used to improve the hardness and wear resistance of titanium alloys for operating in friction assemblies, and it has been shown that chromium can improve the resistance to crack formation during operation under wear conditions.
Abstract: 1.
Application of nickel boride coatings to titanium alloys markedly improves their hardness and wear resistance, and it makes it possible to use titanium alloys for operating in friction assemblies.
2.
Introduction of chromium into the impregnating mixture during annealing activates the boriding process.
3.
Alloying a nickel boride coating with chromium improves its resistance to crack formation during operation under wear conditions.
3 citations
TL;DR: The formation of the structure of the melted coating of self-fluxing alloys is greatly affected by the heating temperature and by the cooling rate of the molten pool.
Abstract: 1.
The formation of the structure of melted coating of self-fluxing alloys is greatly affected by the heating temperature and by the cooling rate of the molten pool.
2.
Laser melting of nickel base self-fluxing coatings is accompanied by the formation of nickel boride Ni2B in the structure of the alloy, and the solid solution is considerably supersaturated with alloying elements.
3.
Treatment of coatings with pulsed laser radiation brings about practically complete homogenization of the structure regardless of its state of disequilibrium.
4.
Supersaturation of solid solution with alloying elements and reduction of the amount of strengthening particles in laser melting impairs only imperceptibly the hardness of the coating compared with the traditional methods of melting.
1 citations
TL;DR: In this article, the preparation of thin films of nickel boride from the thermal decomposition of nido-pentaborane(9) in the presence of anhydrous nickel chloride [NiCl2] in the vapor phase was reported.
Abstract: Several borane cluster compounds, such as pentaborane(9) and their corresponding metal complexes have been investigated in our laboratory for their utility as unique source materials for synthesizing metal/metal boride thin films by MOCVD. In this paper we report the preparation of thin films of nickel boride from the thermal decomposition of nido-pentaborane(9) in the presence of anhydrous nickel chloride [NiCl2] in the vapor phase. Crystalline nickel boride thin films of controlled composition ranging from 0.1 to several microns have been readily prepared by controlling the temperature and the flow rate of the pentaborane(9) into the reaction chamber. The nickel boride films on GaAs were thermally annealed to form the Ni7B3 phase as hexagonal crystals in a Ni3B matrix. These films have been characterized by AA, AES, EDXA, SEM, XRD and electron diffraction. The phases were determined primarily by X-ray and electron diffraction experiments.