The treatment is more delicate, due to the higher percentage of carbon and the natural increase in cementite together with complex carbides which are present in some of the higher types of alloys.
The massive carbides and tungstides present in the ingot are broken down and uniformly distributed throughout the billet.
The great hardness of chromium steels is also due to the formation of doublecarbides of chromium and iron.
It is possible that complex carbides may be formed, as in chromium steels, and that compounds between iron and tungsten exist.
The introduction of the electric furnace into practical chemistry was followed by the preparation of many metalliccarbides previously unknown, some of which, especially calcium carbide, are now of great commercial importance.
The important carbides are mentioned in the separate articles on the various metals.
Carbides of the following general formulae have been obtained by H.
Moissan has also shown that it will combine with many metals at the temperature of the electric furnace, to form carbides (q.
The metallic carbides are crystalline solids, the greater number being decomposed by water into a metallic hydrate and a hydrocarbon; sometimes hydrogen is also evolved.
The carbidesand other compounds of some metals are not stable at high temperatures, being reduced by gaseous carbon to the free metals, which remain then in the gaseous form.
Carbides of other metals can be made in the electric furnace, but, owing to the cheapness of the new material, calcium carbide is the only one of these which has industrial value as a source of acetylene.
The Union Carbide Company, which controls the sale of carbide in the United States, is selling gradedcarbides under guarantee, the first grade being the nearly pure ingot, the lower grade the crust.
Some of those carbides yield acetylene when treated with water, some are not attacked, some give liquid products, and some yield methane, or mixtures of methane and hydrogen.
Before him the drift tunnel, damp and dripping and dark, awaited, seeming to throw back the flare of the carbides as though to shield the treasures which might lie beyond.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "carbides" in a variety of sentences. We hope that you will now be able to make sentences using this word.
