Schaffer powder

Schaffer Powder. Blasting powder patented in Engl in 1863 and 1866 contg K and Na nitrates, sulfur, charcoal and Seignette s salt (K-Na tartrate)... 

Schaffer EM, Liu JZ, Milner JA. Garlic powder and aUyl sulfur compounds enhance the ability of dietary selenite to inhibit 7,12-dimethylbenz[a]anthracene-induced mammary DNA adducts. Nutr Cancer 1997 27 162-168. 

Schaffer, G.B., and McCormick, P.G., Combustion and resultant powder temperatures during mechanical alloying, J. Mater. Sci. Lett., 9, 1014-1016, 1990. 

The mechanical alloying of mixtures of ductile and brittle components results in the brittle particles being trapped at the layered welded interfaces of the ductile component (Benjamin 1970, Maurice and Courtney 1994). Continued milling results in fi-acture of the brittle particles and the development of a uniform distribution of particles of the brittle phase within the matrix of the ductile phase. This is in contrast to the distribution in conventional powder systems where the dispersoid particles are confined to the prior particle boundaries. Mechanically alloyed CDS alloys are an important practical example of a ductile/brittle system. If the volume fraction of the brittle phase is of the order of 0.5, the characteristic layered structure does not form. Rather, the microstructure consists of a uniformly distributed nanocrystalline mixture of the two phases (Schaffer and McCormick 1990a). 

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