Classifications

• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
  • H10D48/00—Individual devices not covered by groups H10D1/00 - H10D44/00
  • H10D48/01—Manufacture or treatment
  • H10D48/07—Manufacture or treatment of devices having bodies comprising cuprous oxide [Cu2O] or cuprous iodide [CuI]
  • H10D48/071—Preparation of the foundation plate, preliminary treatment oxidation of the foundation plate or reduction treatment
  • H10D48/074—Oxidation and subsequent heat treatment of the foundation plate
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
  • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
  • H01L21/02104—Forming layers
  • H01L21/02365—Forming inorganic semiconducting materials on a substrate
  • H01L21/02518—Deposited layers
  • H01L21/02521—Materials
  • H01L21/02565—Oxide semiconducting materials not being Group 12/16 materials, e.g. ternary compounds
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
  • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
  • H01L21/02104—Forming layers
  • H01L21/02365—Forming inorganic semiconducting materials on a substrate
  • H01L21/02612—Formation types
  • H01L21/02614—Transformation of metal, e.g. oxidation, nitridation

Definitions

• This invention relates to the manufacture of alternating electric current rectifiers of the dry surface contact type comprising a body of metal having a compound of the metal formed directly thereon and more particularly to rectifiers of the copper oxide type.
• the resistance in the forward direction should be as low as possible while the resistance in the reverse direction should be as high as possible and that these resistances more particularly the resistance in the reverse direction should be stable and not liable to appreciable creep o continuous change under an applied voltage.
• this result is achieved by heating the copper blanks to approximately the normal temperature of oxidation in an atmosphere consisting wholly or mainly of steam prior to the actual oxidation treatment in air or other oxidising agent.
• the copper blanks are introduced into a furnace having a temperature of approximately 1025 C.
• the internal atmosphere of this furnace is composed wholly or mainly of steam originally introduced from a boiler at a pressure of approximately 15 lb. per and after a period of approximately 3 minutes (when the copper blanks will have attained the furnace temperature) the steam is removed in any suitable manner and replaced by atmospheric air.
• the oxidation in this atmosphere is allowed to proceed for a period of approximately four minutes and the blanks are then transferred to another furnace containing atmospheric air and operated at a temperature of approximately 530 C.
• the blanks remain in this furnace for approximately 10 minutes and are then removed and quenched in the usual manner.
• the blanks subjected to the process of the invention possessed a reverse resistance about 25% higher than that of blanks produced from a much better sample of copper by the process hitherto employed While the reverse creep after-24c hours was only about one quarter of that of blanks produced from the better sample of copper by this latter process.
• the invention is evidently not limited to the particular conditions of heat treatment above specified by way of example.
• A; process for the manufacture of alternating current rectifiers of the copper oxide type comprising the step of heating copper blanks prior to oxidation to approximately the normal oxidation temperature in a steam laden atmosphere.
• a process for the manufacture of alternating current rectifiers of the copper oxide type comprising the step of heating copper blanks prior to oxidation to approximately the normal oxidation temperature in an atmosphere which is composed wholly of steam.
• a process for the manufacture of alternating current rectifiers of the copper oxide type comprising the step of heating copper blanks prior to oxidation to approximatel the normal oxidation temperature in an atmosphere which contains at least 90% of steam.
• a process for the manufacture of alternating current rectifiers of the copper oxide type comprising the steps of introducing copper blanks into a furnace having a temperature of approximately 1025 C. and a steam containing atmosphere, and replacing the said atmosphere by atmospheric air after a period of time sufilcient 10 for the said blanks to attain the furnace temperature.
• a process for the manufacture of alternating current rectifiers of the copper oxide type comprising the steps of heating copper blanks in a 15 steam-laden atmosphere to the temperature of oxidation, and replacing the said atmosphere by atmospheric air after a period of time suflicient for said blanks to attain said temperature of oxidation. 6.
• a process for the manufacture of alternating current rectifiers of the copper oxide type comprising the steps of heating copper blanks first in a steam-laden atmosphere to the temperature of oxidation and then continuing said heating in atmospheric air.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Condensed Matter Physics & Semiconductors (AREA)
• General Physics & Mathematics (AREA)
• Manufacturing & Machinery (AREA)
• Computer Hardware Design (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Power Engineering (AREA)
• Apparatuses And Processes For Manufacturing Resistors (AREA)
• Heat Treatment Of Articles (AREA)
• Soft Magnetic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10328099

Family Applications (1)

Country Status (5)

Cited By (2)

• 0
  • NL NL666616163A patent/NL142450B/xx unknown
• 1947
  • 1947-12-02 GB GB31767/47A patent/GB629795A/en not_active Expired
• 1948
  • 1948-09-22 FR FR972158D patent/FR972158A/fr not_active Expired
  • 1948-11-06 US US58810A patent/US2531535A/en not_active Expired - Lifetime
• 1950
  • 1950-09-12 DE DEW3559A patent/DE833088C/de not_active Expired

Non-Patent Citations (1)

Also Published As

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