DE178465C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JYi 178465 CLASS 21 /. GROUP

Patented in the German Empire on December 6, 1904.

The subject of the present invention is an arc lamp electrode which has a A strong, luminous, white light emitting arc is generated and only burns down very slowly. The subject matter of the invention is also a method for producing these electrodes serving procedure.

The essence of the invention is that the electrode exclusively or partially Contains titanium suboxide.

When manufacturing the electrodes forming the subject matter of the invention, the following can be done Procedures to be followed:

First, an intimate mixture is made from about 7 parts of rutile (Ti OJ and 1 part of coal. This mixture is heated to about 1500 to 2000 ° C., whereby the titanium oxide is reduced to titanium suboxide. The mixture becomes before or after the reduction to When shaping the material, in order to make it kneadable, the material is moistened with water, which advantageously contains little glycerine.

The titanium suboxide produced in the manner described above is darker bluish in color Color, and the electrodes made from it are homogeneous and of great size Strength.

Since the titanium suboxide conducts electricity well at ordinary temperature, need the electrodes made from it, in order to increase the efficiency, as a rule not to be subjected to any subsequent ■ treatment. But when using it A non-conductive coating is formed at their ends, which the application of a makes special starting device necessary.

Since the arch that is made of titanium suboxide or containing titanium suboxide Forms electrodes, emits such a large amount of light that the light from the glow of the electrode tips is completely can be dispensed with or neglected, it is sufficient to make the negative electrode from such Titanium suboxide material to form, while as a positive electrode a highly conductive Material, e.g. B. copper can be used. The positive electrode is like that too measured that it is not so strongly heated by the arch that it is harmful Subject to oxidation.

With the above-mentioned mixing ratios, the coal is in a slightly larger amount used as theoretically necessary for the conversion of titanium oxide into titanium suboxide is. This is necessary to get good results.

Although most of the titanium is converted to titanium suboxide, it remains a small part of it in the form of

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Oxide, while a small part is reduced to metallic titanium. The presence however, these materials in such a small amount can affect the properties of the electrode not affect.

Instead of making the electrode purely from titanium suboxide, one can be more or less Titanium suboxide-containing mixture can be used for this purpose, to which ίο various known additives are added can.

Claims (3)

Patent-to sayings: i. Arc lamp electrode, characterized in that it is exclusively or partially contains titanium suboxide. 2. A method for producing the electrode according to claim 1, characterized in that that a mixture of titanium oxide (advantageously rutile) and coal in the for the reduction to the suboxide approximately required mixing ratios (approximately 7: 1) is heated to the temperature required for reduction and from it before or after the reduction, the electrodes with the addition of water with a little glycerine and optionally with the desired admixtures are formed. 3. The use of the electrode according to claim 1 as a negative electrode in connection with a metallic positive electrode.