Dating of non carbonaceous materials

However, shaped articles of the carbonaceous material impregnated with the lead glass are unstable and very susceptible to oxidation at high temperatures of above about 650° C., while they remain to be improved in abrasion resistance.Shaped articles of the carbonaceous material impregnated with the borate glass, although having slightly higher stability at high temperatures, are still unstable and prone to oxidation at temperatures exceeding about 800 ° C.Another object of the invention is to provide a shaped article of carbonaceous material having greatly improved resistance to abrasion.Another object of the invention is to provide a shaped article of carbonaceous material having high resistance to chemicals.Carbon generally forms four covalent bonds with other atoms in larger molecules.Atomic number 6; atomic weight 12.011; sublimation point above 3,500°C; boiling point 4,827°C; specific gravity of amorphous carbon 1.8 to 2.1, of diamond 3.15 to 3.53, of graphite 1.9 to 2.3; valence 2, 3, 4.Another object of the invention is to provide a shaped article of carbonaceous material having high impermeability.

Tests for DBT oxidation indicate that Nb significantly improves the removal of such pollutants in biphasic reactions with removal around 90% under the tested conditions.

They have somewhat improved but still insufficient resistance to abrasion.

Furthermore, the carbonaceous material impregnated with the borate glass has low resistance to chemicals, with the result that the shaped article prepared from the material inevitably deteriorates easily when brought into contact with hot water or an aqueous acid or alkali solution.

Ikeda, Shigeru (Kawanishi, JP) Hori, Shozi (Takatsuki, JP) Eguchi, Kiyohisa (Kawanishi, JP) Matsuo, Kanji (Ikeda, JP) Zaima, Hidenori (Kanazawa, JP) Gamada, Yoshifumi (Neyagawa, JP) Kondo, Teruhisa (Toyonaka, JP) is one of tetravalent metals including Ti and Zr. A shaped article as defined in claim 2 wherein the borosilicate glass contains the third component in an amount of 5 to 40 wt. This invention relates to shaped articles of carbonaceous material and a process for preparing the same, and more particularly to shaped articles of carbonaceous material impregnated with glass and a process for preparing such articles.

A shaped article as defined in any one of claims 1 to 3 which is used as a graphite electrode. A shaped article as defined in any one of claims 1 to 3 which is used as a sliding member. A shaped article as defined in any one of claims 1 to 3 which is used as a heat generating member. A shaped article as defined in any one of claims 1 to 3 which is used as a machine part for use in refining or working a metal.

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Images obtained by TEM and SEM show the typical morphologies of carbonaceous materials without the niobium oxide formation signal, which indicates the presence of niobium complexes as isolated sites on the carbon surfaces.

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