One-step synthesis and consolidation of nanophase materials

B - Operations – Transporting – 22 – F

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Details

B22F 3/12 (2006.01) C04B 35/58 (2006.01) C04B 35/645 (2006.01) H05B 3/00 (2006.01)

Patent

CA 2381369

Solid reaction products with a dense nanocrystalline structure are formed from reactant particles with diameters in the nano-scale range by compacting the particles into a green body, then passing an electric current through the body causing Joule heating sufficient to initiate the reaction to form the reaction product while simultaneously applying pressure to the reacting body to densify it to a density approaching the theoretical density of the pure product. Surprisingly, this process results in a reaction product that retains the nanocrystalline structure of the starting materials, despite the fact that a reaction has occurred and the materials have been subjected to highly stringent conditions of electric current, heat and pressure.

On prépare des produits réactionnels solides présentant une structure nanocristalline dense à partir de particules réactives possédant des diamètres de l'échelle du nanomètre, ce qui consiste à compacter ces particules afin d'obtenir un corps vert, puis à faire passer un courant électrique à travers le corps, ce qui provoque un réchauffement par effet Joule suffisant pour déclencher la réaction permettant d'obtenir le produit réactionnel, tout en appliquant simultanément une pression au corps réactionnel, de manière à le densifier jusqu'à une densité se rapprochant de la densité théorique du produit pur. Ce procédé permet d'obtenir un produit réactionnel conservant la structure nanocristalline de matériaux de départ, indépendamment du fait de la réaction et de la soumission des matériaux à des conditions très sévères de courant électrique, de chaleur et de pression.

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