Details

Autor(en) / Beteiligte

• Wen, S. H.
• Sha, J. B.

Titel

Improvement of “Pest” Resistance of MoSi2 Intermetallic Compound at 500 °C and 600 °C via Addition of B Fabricated by Spark Plasma Sintering

Ist Teil von

• Oxidation of metals, 2019-10, Vol.92 (3-4), p.243-257

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Mo–Si–B alloys were obtained by spark plasma sintering (SPS) using fine Mo–Si–B alloy powders with a particle size of 2.5 μm. The SPS Mo–Si–B alloys consisted of fine MoSi 2 /Mo 2 Bi 5 (Mo 5 Si 3 )/MoB/SiO 2 phases. Under isothermal conditions, the weight-gain kinetics of the Mo–Si–B alloys obtained by SPS exhibited parabolic time dependence and these Mo–Si–B alloys showed better oxidation resistance at moderate temperatures of 500 °C and 600 °C with no “pest” failure. The oxide scale on the sample surface consisted of MoO 3 , amorphous borosilicate and crystalloid SiO 2 phases. An increase in the oxidation temperature from 500 to 600 °C caused a significantly higher fluidity and a shorter incubation stage for the formation of a continuously protective borosilicate layer, so that the mass gain was smaller than 1 mg/cm 2 for oxidation at 600 °C for 100 h, which corresponds to the excellent oxidation resistance. Graphic Abstract