Formed articles including master alloy, and methods of...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/03 (2006.01)

Patent

CA 2742657

The application relates to the problem of alloying a melt, preferably a titanium melt, with oxygen by adding formed articles such as pellets containing a master alloy such as Ti02. The articles should fully and homogeneously disperse in the melt, while the carbon content of the melt should be kept below an allowable maximum, preferably below 0.04 wt. %. The formed article may also comprise iron or palladium. To solve this problem, the formed article consists of 70-82wt. % of a master alloy an 18-30wt. % of a high-carbon organic polymer such as ethylene vinyl acetate or a low density polyethylene. The homogeneous dispersion is achieved e.g. by the formed articles having a similar size as the other raw feed materials which are added to the melt.

La présente demande a pour objet le problème consistant à allier un bain fondu, de préférence un bain fondu de titane, avec de l'oxygène en ajoutant des articles formés comme des boulettes contenant un alliage maître comme Ti02. Les articles devraient être entièrement dispersés de manière homogène dans le bain fondu, tout en maintenant la teneur en carbone du bain sous un maximum permis, de préférence sous 0,04 % en poids. Les articles formés peuvent aussi contenir du fer ou du palladium. Pour résoudre ce problème, l'article formé est constitué de 70-82 % en poids d'un alliage maître et de 18-30 % en poids d'un polymère organique à haute teneur en carbone comme un coplymère d'éthylène et d'acétate de vinyle ou un polyéthylène de faible densité. La dispersion homogène est obtenue, par exemple, en utilisant des articles formés ayant une taille similaire à celle des autres matériaux d'alimentation qui sont ajoutés au bain fondu.

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