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

C - Chemistry – Metallurgy – 22 – C

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C22C 1/03 (2006.01)

Patent

CA 2598128

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 concerne un problème de préparation d~alliage dans un bain, de préférence un bain de titane, avec de l'oxygène en ajoutant des articles formés tels que des granules contenant un alliage mère tel que le TiO2. Les articles devraient se disperser entièrement et de manière homogène dans le bain, tout en maintenant la teneur en carbone du bain en dessous d'un maximum autorisé, de préférence en dessous de 0,04 % en poids. L'article formé peut également comprendre du fer ou du palladium. De façon à résoudre ce problème, l'article formé est constitué de 70 à 82 % en poids d'un alliage mère, de 18 à 30 % en poids d'un polymère organique à teneur élevée en carbone tel que le polymère d'éthylène et d~acétate de vinyle ou un polyéthylène de basse densité. La dispersion homogène est obtenue, par exemple, par l~intermédiaire des articles formés ayant une taille analogue aux autres matières premières d'alimentation ajoutées au bain.

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