Abstract
1. The ignitability of the powders of 12 transient metals, and also boron, was investigated. 2. The ignitability of the powders of a number of refractory compounds was investigated for the first time. 3. A method was worked out and the ignitability of powders was investigated under conditions of heating them from a point heat source. 4. It was established that the powders of zirconium, niobium, tantalum, molybdenum, tungsten, titanium, iron, and boron are most pyrophoric. 5. The investigated borides did not ignite even up to 1100° C. 6. The ingition point of the carbides of zirconium, hafnium, niobium, and tungsten is below 1100° C.
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