Inorganic compounds
AssigneeH. C. Starck GmbH
InventorsFrank Schrumpf, Wolfgang Kiliani, Stefan Frässle, Thomas Schmidt
Life of this patent
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Abstract
The invention is related to a boride of a metal of transition group four of the periodic table of the elements, wherein at least 40 wt. % of the particles have a grain size of more than 106 μm, determined by sieve analysis according to ASTM B 214, and these particles consist of grown, monocrystalline grains. The invention also relates to a cermet, wettable powder and a surface coating which contain the boride. The invention further relates to a process to prepare the boride. The invention additionally relates to a process to prepare a cermet or a wettable powder.
Claims23
1-21. (canceled)
A boride of a metal of transition group four of the periodic table of the elements, wherein at least 40 wt. % of the particles have a grain size of more than 106 μm, determined by sieve analysis according to ASTM B 214, and these particles consist of grown, monocrystalline grains.
A process for the preparation of a boride of metals of transition group four by reacting boron carbide with at least one oxide of a metal of transition group four in the presence of carbon, which comprises carrying out the reaction in the presence of an alkali or alkaline earth metal salt having a high boiling point of at least 1800° C., boron carbide is used in excess, and the reaction is carried out at a temperature of more than 2000° C.
Dependencies are inferred from the claim text.