Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/004—Details
  • H01G9/04—Electrodes or formation of dielectric layers thereon
  • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/004—Details
  • H01G9/04—Electrodes or formation of dielectric layers thereon

Definitions

• This invention relates to a process for the production of thin aluminum strips or sheets with a predominant proportion of so-called block crystalline texture.
• the block texture also known as the cubic texture, of a metal such as aluminum denotes the case where the crystals are oriented in such a way that their crystallographic plane of Miller indices (100) is substantially parallel to the plane of the sheets, while their crystallographic direction of Miller indices[l0] is substantially parallel to the direction in which the sheet is rolled.
• a texture of this kind is represented by the symbol (100) [010].
• the crystalline texture of aluminum in its annealed state is generally complex. It can comprise the block texture and other types of texture such as those where the plane (123) or the plane (112) is parallel to the plane of the sheet.
• the process according to the invention is distinguished by the fact that, between hot-rolling and the final recrystallization annealing treatment, the metal is subjected l. to cold rolling with a cold-working rate, defined as the ratio between the variation in thickness and the final thickness, of greater than 1,000 percent and preferably greater than 2,000 percent.
• the initial stages of cold rolling can be interrupted by an annealing treatment carried out over a period greater than or equal to 1 hour at a temperature of from 300 to 350 C.while maintaining a subsequent cold-working rate of greater than 1,000 percent without any adverse affect upon the final result.
• This blank was cold-rolled to a thickness of 0.115 mm. corresponding to a cold-working rate of 2,950 percent.
• Intermediate annealing was carried out under the variable conditions indicated in Table 1 below in a static furnace in coil form. After this annealing treatment, followed by cooling in air, various cold-rolling operations were carried out in the main rolling direction in order to determine the cold-working rate which corresponds to the maximum block texture percentage after final annealing.
• the final recrystallization annealing treatment was carried out in a nitrogen-filed static furnace in coil form for a period of 2 hours at 450 C. Cooling after annealing was carried out in the open air.
• the crystalling texture obtained is monitored by a known micrographic method in which so-called corrosion figures characteristic of the crystalline orientation of the grains are made to appear on the surface of a sample of thin sheet by treatment in an aggressive chemical reagent, and the proportion by volume of crystals oriented in the direction (l)[010] determined.
• Table I gives the results obtained in dependence upon the intermediate annealing conditions by comparison with a sheet treated in the absence of intermediate annealing.
• Optimum coldworking rate lnter- (after intermediate mediate an- Block texture Modification Anneal nealing) component after produced by ing final annealing the process No annealing 50% 16 hrs. slight improveat 150C. 30% 55% ment( 16 hrs. marked improveat 200C. to 25% 90 to 95% ment(+ 40-45%) 1 hr. marked improveat 250 C. 5 to 25% 90% ment(+ 40%) 1 hr. marked improveat 270C. 10 to 20% 85 to 90% ment(+ 35 -40%) 1 hr. slight improveat 300C. 65% ment(+ 15%) l hr. slight deteriorat 350C. 15% 45% ation( 5%) 4 min. distinct improveat 350C.
• EXAMPLE 2 In order to demonstrate the influence upon the coldworking rate after intermediate annealing for a constant final thickness, the intermediate annealing and final annealing conditions being constant, a blank hotrolled to a thickness of 3.5 mm, identical with that of the preceding example, was taken and subjected to the cold-rolling treatments indicated in Table II, the intermediate annealing treatment being carried out over a period of 24 hours at 200 C. while the final annealing treatment was the same as in the preceding example.
• a blank of aluminum with a total iron, silicon and copper content of 0.04 percent hot-rolled to a thickness of 3.5 mm was used for the test; It was coldrolled to a thickness of 0.14 mm, after which it was subjected to intermediate annealing for 16 hours at 250 C. and then to rolling to a thickness of 0.12 mm.
• the final annealing treatment was carried out in a nitrogen atmosphere over a period of 2 hours at 450 C.
• the block texture component obtained amounted to percent which is remarkable in view of the low purity of the metal.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Crystallography & Structural Chemistry (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Metal Rolling (AREA)
• Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
• Manufacturing Of Steel Electrode Plates (AREA)
• Heat Treatment Of Sheet Steel (AREA)

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Publications (1)

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ID=9064168

Family Applications (1)

Country Status (11)

Cited By (6)

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Citations (3)

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• 1970
  • 1970-11-16 FR FR707040921A patent/FR2113782B1/fr not_active Expired
• 1971
  • 1971-08-13 GB GB3815871A patent/GB1366353A/en not_active Expired
  • 1971-08-17 JP JP6252571A patent/JPS5411242B1/ja active Pending
  • 1971-08-20 US US00173698A patent/US3716419A/en not_active Expired - Lifetime
  • 1971-08-25 CA CA121,349A patent/CA941718A/en not_active Expired
  • 1971-11-13 ES ES397001A patent/ES397001A1/es not_active Expired
  • 1971-11-15 IT IT54093/71A patent/IT944936B/it active
  • 1971-11-15 LU LU64261D patent/LU64261A1/xx unknown
  • 1971-11-15 NL NLAANVRAGE7115648,A patent/NL174272C/xx not_active IP Right Cessation
  • 1971-11-15 CH CH1654871A patent/CH537761A/fr not_active IP Right Cessation
  • 1971-11-16 BE BE775369A patent/BE775369A/xx not_active IP Right Cessation

Patent Citations (3)

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