Conclusions
Hot-pressed silicon nitride parts of 1.5–4% porosity containing a 10 wt. % activating addition of MgO are resistant to corrosion by nitric acid at room temperature and by 1% NaOH solution at 100°C under steady-state conditions. The presence of 1–20 wt. % CaF2 added with the aim of improving antifriction properties results in corrosion in nitric acid, obeying the law m2=Kτ, where K ∼ 5.5·10−5· C3 %2/h). The corrosion is due to attack on specimens by hydrofluoric acid forming during the reaction between the CaF2 and HNO3.
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Translated from Poroshkovaya Metallurgiya, No. 1(205), pp. 70–72, January, 1980.
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Postogvard, G.I., Makarenko, A.E., Ryzhova, T.P. et al. Resistance of materials based on silicon nitride to corrosion by solutions of some acids and alkalis. Powder Metall Met Ceram 19, 52–54 (1980). https://doi.org/10.1007/BF00798165
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DOI: https://doi.org/10.1007/BF00798165