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- W2020172132 abstract "Failure of brittle materials starts in general from defects which exist in the volume or on the surface of the specimens. Surface flaws, which are more dangerous than volume flaws, can be introduced by machining. They decrease the strength of specimens and components. For this investigation silicon nitride specimens were produced using different machining conditions. About half of them were strength tested by use of the biaxial ball-on-three balls (B3B) test. It has been shown that better (more gentle) machining increases the strength but may also cause an increased scatter of strength data. The remaining specimens were heat treated (annealed) at 1000 °C in air and afterwards also strength tested using the B3B test. Compared to the non heat treated specimens a significant increase in strength could be proven, which was – depending on the machining conditions – between almost 300 MPa and more than 500 MPa. The scatter of strength data was largely decreased. The improvement was caused by the formation of a thin (0.5–2 μm) glassy layer which filled surface cracks and surface related pores during annealing." @default.
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- W2020172132 date "2012-01-01" @default.
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- W2020172132 title "Influence of surface defects on the biaxial strength of a silicon nitride ceramic – Increase of strength by crack healing" @default.
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- W2020172132 doi "https://doi.org/10.1016/j.jeurceramsoc.2011.07.019" @default.
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