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Per‐ and polyfluorinated alkyl substances are large class of man‐made compounds known in the media as “forever chemicals”. In 2015, ASTM International published ASTM D7979, for the analysis of per‐ and polyfluorinated alkyl substances in non‐potable water samples. This method extracts the substances by co‐solvation with methanol and measures targeted compounds using liquid chromatography–tandem mass...
The wear of nitrogen based ceramics in contact with bearing steel balls (SAE 52100) was investigated under reciprocating sliding conditions at a velocity of 0.1 m/s, and 20 N, 40 N and 100 N load. Three types of ceramics were studied: viz. hot pressed silicon nitride (HPSN) sintered with selected liquid in the system yttria-aluminium nitride-silica and composites of HPSN with BN and TiC; SiAlON formulated...
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