Components for apparatus of various shapes are formed from inorganic particulate materials and binders. The base material is selected from the metal oxides and those metals and metal carbides which contain a small amount of oxide on the surface, for example, alumina. These particles are treated with a binder solution which may be any solution of an inorganic compound that can be converted to an oxide on being heated, for example, chromium trioxide solution. The particles are then coated with a fine powdered material of the same composition as the base particles to form free-flowing pellets. The pellets are then heated to convert the binder material to the oxide form. The treatment with binders and the heating step are then repeated as often as desired. The pellets are then impregnated with additional binder and formed into the desired shape and again heated. The formed shape is then impregnated with additional binder and heated as often as desired to obtain the desired properties. The shapes can then be machined and various shapes can be joined together.
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