The effect of sintering on ultimate strength in bending and compression indices is studied for castings based on both fuzed quartz HCBS with different fineness, and cast systems with a granular filler based upon them. An effect is detected of a significant increase in strength in the specimen heating stage (nonisothermal sintering), and maximum strength indices for the majority of materials is achieved after isothermal soaking at 1250°C for 0.5 – 1.0 h. The correlation of shrinkage during sintering with material properties is analyzed. It is established that maximum strength is achieved with firing shrinkage of up to 1%. Relative compaction indices (or proportion of sintering pores) are found in the range 0.2 – 0.4.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 14, 2015
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