Abstract
Thermal-insulation inserts manufactured on the basis of unfired Iovsk dunite had the same properties as those made from fired Solov'evogorsk dunite and met the requirements of TU 14-8-357-80 with amendments 1 and 2. No burning of the insert was observed and the surface of the head part of the casts was clean and even. The range of the shrinkage defects in the slabs of the experimental and standard casts was virtually identical and was ≤7%. The average value of the leading-edge trim in the case of the experimental and standard casts was virtually identical (9.99 and 10.09%, respectively). The same was also noted for the additional shrinkage segregation and the degree of chemcial nonuniformity at the level of the leading-edge trim.
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