Transactions of the Electrochemical Society Volume 16

Transactions of the Electrochemical Society Volume 16

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...phenomenon is characteristic of titanium carbide. A bare electrode oxidizes at a point % to 4 inch below the tip, the stick swells, and the top falls off. The copper plating effectually prevented this, and did not interfere materially with the running of the arc. The life of the carbide stick varies, of course, with the current density and inversely with the diameter of the electrode. At about 3 amperes a stick inch in diameter wastes away at the rate of 1/15 to 1/10 inch per hour. During the running of the arc the whole of the upper surface of the electrode does not melt, but simply appears moist at the point at which the arc is playing. The more nearly the composition of the stick approaches metallic titanium, the higher the melting point, and it is certain, from a number of experiments made in connection with the preparation of these sticks, that metallic titanium is one of the most refractory metals known. The titanium carbide arc may also be operated with the alternating current under certain conditions, but the results of this work cannot be presented at the present time. The T1tan1um Sub-ox1de Arc: D1rect Current. The material used in these experiments was prepared in the electric furnace by the reduction of rutile. Its preparation is quite easy, since the melting point of the product is much lower than that of the carbide. The character of the arc is almost identical with that of the carbide arc, but the light is much steadier and the tip of the electrode does not oxidize and fall off. It is therefore not necessary to plate the sticks or cover them with a metallic sheath. There are certain objections to this electrode, and among these are the tendency to form large, troublesome deposits on the anode, and the fairly more

Product details

  • Paperback | 162 pages
  • 189 x 246 x 9mm | 299g
  • United States
  • English
  • black & white illustrations
  • 1236843258
  • 9781236843258