Method of plasma treatment of materials
OwnerMikhail G. Fridlyandinventor
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Abstract
Disclosed is a method of plasma treatment of materials comprising introducing a plasma-forming mixture including carbon-containing compounds chosen from the class of hydrocarbons or carbon monoxide into the space between the electrodes of an electric arc device to provide deposition of carbon at least on one of the electrodes of an electric arc device in the course of arc burning, striking an electric arc, and introducing an oxidizing agent into said space between the electrodes to improve the stability of arc burning, the oxidizing agent being introduced into said space between the electrodes over a time interval between the instant when a heat flow into the electrode whereon carbon is deposited reaches its maximum value and the instant when said heat flow drops down to a steady value.
Claims15
A method for plasma treatment of materials comprising:
- introducing a first flow of a plasma-forming gas mixture including carbon-containing compounds selected from hydrocarbons in the amount of from (0.5.times.10.sup.-3)/n l/amp-sec to (6.times.10.sup.-3)/n l/amp-sec, into the space between the electrodes of an electric arc device to provide deposition of carbon at least on one of the electrodes of the electric arc device in the course of arc burning, where "n" is a number of atoms of carbon in the employed carbon-containing compound, said amount depending on the chemical affinity of an oxidizing agent for said carbon-containing compound;
- striking an electric arc;
- measuring a quantity of heat flowing into one of said electrodes upon which carbon is deposited;
- detecting a peak in said quantity of heat;
- adding a second flow of an oxidizing agent to said first flow beginning at said peak;
- substantially reducing said second flow when said heat flow drops down to a steady value, whereby stable and reliable arc burning is provided.
A method of plasma treatment of materials comprising:
- introducing a first flow of a plasma-forming gas mixture including carbon-containing compounds selected from hydrocarbons into the space between the electrodes of an electric arc device to provide deposition of carbon at least on one of the electrodes of the electric arc device in the course of arc burning;
- striking an electric arc;
- measuring a quantity of heat flowing into one of said electrodes upon which carbon is deposited;
- detecting a peak in said quantity of heat;
- adding a second flow of an oxidizing agent to said first flow beginning at said peak;
- and
- substantially reducing said second flow when said heat flow drops down to a steady value, whereby stable and reliable arc burning is provided.
A method of plasma treatment of materials comprising:
- introducing a first flow of a plasma-forming gas mixture including carbon-containing compounds in the form of carbon monoxide into the space between the electrodes of an electric arc device to provide deposition of carbon at least on one of the electrodes of the electric arc device in the course of arc burning;
- striking an electric arc;
- measuring a quantity of heat flowing into one of said electrodes upon which carbon is deposited;
- detecting a peak in said quantity of heat;
- adding a second flow of an oxidizing agent to said first flow beginning at said peak;
- substantially reducing said second flow when said heat flow drops down to a steady value, whereby stable and reliable arc burning is provided.
Dependencies are inferred from the claim text.