Refractory metal structures

专利名称：Refractory metal structures发明人：BERGSTROM THEODORE R.申请号：US482067申请日：19670609公开号：US3403009A公开日：19680924

摘要：Sintered Mo, W or Cr containing 0.04-0.8% by weight of carbon and having anaverage grain size of not more than 0.025 mm. is formed by sintering a mixture of thepowdered metal and sufficient of an organic film forming non-volatile polymer binderwhich decomposes on sintering to give the required carbon content. The mixture contains1.5 to 10% of organic binder which may be in the form of a solution and the slurry orpaste may be shaped by rolling, pressing, extruding, or knife coating. The green shapese.g. sheets may be joined together with a binder, pre-sintered and finally sintered inhydrogen or in hydrogen followed by a vacuum sintering or by vacuum sintering alone.The binders which may be used are methyl or ethyl cellulose, polyvinyl alcohol, celluloseacetate, phenol-formaldehyde resins, urea aldehyde resins, polyimides &c. Plasticisersand organic solvents are also specified.

申请人：MINNESOTA MINING AND MANUFACTURING COMPANY

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