Corrosion Resistance of Ceramic Articles Fabricated From -SiAlON Nanopowder

SiAlON ceramics are a special class of corrosion resistance materials. This property in addition to high strength and good thermal shock resistance make it a good choice for chemical industries. SiAlONs also have high wear resistance, low thermal expansion and good oxidation resistance up to above 1000°C. Therefore chemical resistance of SiAlONs under oxidation condition should be considered. In this work, corrosion resistance of standard specimens prepared from self-made SiAlON nanopowder was investigated. In order to carry out the corresponding corrosion resistance tests, disc shaped samples were prepared using pressureless sintering technique and Y2O3, SiO2, Al2O3 as sintering aids. Various acids such as hydrochloric and sulphuric acids and alkalis such as sodium hydroxide were used. Corrosion resistance was estimated based on weight loss. Hardness of samples was also measured before and after chemical tests. The results showed that -SiAlON exhibited very good corrosion resistance against H2SO4, HNO3, HCl and H3PO4 media, also no significant change in hardness after chemical tests.

کلیدواژه ها:

b -SiAlON ، Nanopowder ، Corrosion Resistance