Boriding of nickel in a fluidized bed reactor

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

“…However, some processes, widely used for steels such as case-hardening or diffusion carburizing [5,6], were not appropriate for Ni-based alloys because of the very low solubility of carbon in nickel [7]. While such a surface treatment as boriding [8][9][10][11][12][13][14][15][16][17][18][19], nitriding [20][21][22][23][24][25][26][27][28][29][30] as well as physical and chemical vapor deposition [31][32][33] increased the hardness and wear resistance of the considered superalloys.…”

“…The presence of SiC in such a powder mixture resulted in the formation of porous nickel silicides, which diminished the hardness of borided layers. Fluidized bed technology was also not proper to boronizing of nickel because the obtained layers were characterized by a relatively low hardness (870 HV) and thickness (35 mm) [18]. Nickel-based alloys could be effectively borided using the powder mixtures without SiC [12][13][14][15].…”

Study on effects of alternating current field to pack boriding of medium carbon steel

“…7 Boriding could be carried out more efficiently by fluidised bed technology. 8 Direct current field assisted pack boriding proposed by the present authors have been proved to be an effective new technique in enhancing pack boriding and lowering the treating temperature. [9][10][11] After developing the direct current field assisted pack boriding technique, present authors have been attempting to employ an alternating current field (ACF) in pack boriding for enhancing the process.…”

“…Many efforts have been made for overcoming these disadvantages by optimising the process parameters, 4,5 adding more active agent into the pack boriding medium 6 and employing new techniques. [7][8][9] A boride layer could be reached at a lower boriding temperature with shorter boriding time by the spark plasma sintering technique. 7 Boriding could be carried out more efficiently by fluidised bed technology.…”

Caracterización por Microscopia Electrónica de Barrido del recubrimiento no electrolítico de níquel (Electroless Nickel) sobre piezas de hierro boronizado

“…Para el caso de este tipo de materiales, la difusión de boro en la superficie viene acompañada de una reacción química, en la cual se forman fases cristalinas de boruros de hierro, como la Fe2B y la FeB (véase figura 9), las cuales son las responsables de un gran número de propiedades [18]. Otros materiales, en los que también se ha reportado la aplicación del borizado, son las aleaciones de níquel, cobalto y titanio [19][20][21].…”