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Abstract

Diffusion aluminizing, when applied to titanium is effected with little or no activator to produce more uniform case and less etching. Workpieces are very rapidly pack-diffusion coated by using an excess of energizers in the pack, heating the retort containing the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling the retort. Diffusion aluminizing can also be applied to foils and powder to make pyrophoric product after leaching out much of the introduced aluminum. Powder can also be diffusion boronized. Pyrophoric boron-containing iron or nickel powder mixed with Ba(NO.sub.3).sub.2 will ignite to cause generation of large quantity of NO.sub.2 gas, and generation is improved when powdered boron and/or an oxidizer like NaClO.sub.3 is added. Pyrophoric articles containing substantial alloyed boron can be placed in good thermal contact with cool heat sink and exposed to air to stabilize them so that they do not begin to pyrophorically react unless heated to over 70.degree. C. Magnesium powder mixed with powdered boron and Ba(NO.sub.3).sub.2 makes explosive composition.

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