Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J2229/00—Details of cathode ray tubes or electron beam tubes
  • H01J2229/07—Shadow masks
  • H01J2229/0727—Aperture plate
  • H01J2229/0733—Aperture plate characterised by the material

Definitions

• the invention relates to a low-expansion iron-nickel alloy with special mechanical properties.
• iron-based alloys with about 36% nickel have low coefficients of thermal expansion in the temperature range between 20 and 100 ° C. For this reason, these alloys have been used for several decades where constant lengths are required, even with temperature changes, such as precision instruments, watches or bimetals. With the development of color television sets and computer monitors in the direction of higher resolution, color fidelity and contrast strength even under unfavorable lighting conditions and especially in view of the trend towards ever flatter and larger screens, iron-nickel materials are increasingly being used for shadow masks.
• a low-expansion material with an improved creep resistance compared to the previously used alloy is required.
• the shadow masks and the frame parts for the shadow masks are subjected to so-called blackening annealing at temperatures up to about 580 ° C. This creates a dark iron oxide layer with which a better visual image quality is achieved.
• the previously used iron-based alloy with approximately 36% nickel achieved a creep resistance Aso of approximately 2.6% under the following test conditions: 1 hour at 580 ° C under a load of 138 MPa.
• the prestressing of the shadow masks in the vertical direction is generated with the vertical frame parts.
• iron-nickel alloys with approximately 41% nickel have been used as the material, these alloys being known as materials for, for example, metal glass melting or for lead frames.
• the technological properties are as follows:
• the creep resistance A ⁇ o is about 0.5%, measured under the same test conditions as before for the 36% nickel-containing alloy, ie 1 hour at 580 ° C under a load of 138 MPa.
• the vertical frame parts made of this alloy expand according to a thermal expansion coefficient of about 4.8 x 10 "6 / K in the temperature range from 20 to 100 ° C more than the shadow mask made of the iron-nickel alloy with about 36% nickel is made.
• Newly developed materials for the horizontal frame parts are said to have the same low thermal expansion properties as the iron-nickel alloy previously used for the shadow masks, which, in addition to iron and about 36% Ni, contains only minor additives due to manufacturing.
• suitable additives to iron-nickel alloys can increase the hardness.
• molybdenum and chromium are used in combination with carbon. This increases the yield strength and strength.
• too high total contents of the elements molybdenum, chromium and carbon can increase the coefficients of thermal expansion too much.
• the object of the invention is to develop a creep-resistant and low-expansion iron-nickel alloy in such a way that it no longer has the disadvantages mentioned in the prior art, is inexpensive to manufacture and can be used for a large number of technical fields of application.
• This goal is achieved with a creep-resistant and low-expansion iron-nickel alloy, which (in mass%) in addition to 0.02 to 0.3% C, max. 1% Mn, max. 1% Si, a Mo content of 0.1 to 2.5% and / or a Cr content of 0.1 to 2.5%, ⁇ 1% Nb and a Ni content of 31.0 to 45, 0% includes residual iron and additives due to manufacturing, the alloy having a thermal expansion coefficient of ⁇ 6.0 x 10 "6 / K in the temperature range from 20 to 100 ° C.
• the technological properties required for use as a material, in particular for vertical frame parts of shadow masks, can be set using the iron-nickel alloy according to the invention, the composition being chosen with regard to the contents of Ni, Mo, Cr and C. can be that the desired coefficients of thermal expansion and mechanical properties are present.
• the subject of the invention can also preferably be used for the following items:
• a preferred composition E1 of the alloys according to the invention for use as a material for the vertical frame, for example for a screen, contains, in addition to the contents (in mass%) of 37 to 39% Ni, 1.6 to 2.0% Mo, 0.6 up to 1.0% Cr and moreover 0.22 to 0.28% C and max. 1% Mn, max. 1% Si, max. 1% Nb and usual manufacturing-related additions in only a very small amount.
• the thermal expansion coefficient between 20 and 100 ° C with about 4.2 x 10 "6 / K and the entire temperature-dependent course of the expansion coefficient between room temperature and 600 ° C are comparable to the value or the course of the previously used two-component alloy T1 in the state of the Technology which contains only additions due to manufacturing in addition to iron and about 42% Ni
• the improvement in mechanical properties necessary for the application has been achieved with the alloy according to the invention, in particular in that the creep resistance, measured on a 1.4 mm thick cold-rolled sample, is used as elongation A ⁇ o at 580 ° C and even at one one hour higher load of 200 MPa, with a value of about 0.04% is given.
• the alloy E1 according to the invention is distinguished by excellent processability and does not require any additional process steps during production.
• the frame can be bent straight from the cold rolled state.
• the mechanical properties are given in this state, as described above. It also shows the long-term stability of its thermal properties that meets the needs.
• a further preferred composition E2 of the alloys according to the invention for use as a material for the vertical frame, for example of a monitor contains, in addition to the contents (in mass%) of 35 to 38% Ni, 1.0 to 1.6% Mo, 0.2 up to 0.6% Cr and moreover 0.1 to 0.18% C and max. 1% Mn, max. 1% Si, max. 1% Nb and usual manufacturing-related additions in only a very small amount.
• the coefficient of thermal expansion between 20 and 100 ° C. is about 2.8 x 10 "6 / K lower than in the case of the alloy E1 according to the invention.
• the improvement in mechanical properties necessary for the application is also achieved with the alloy E2 according to the invention, in particular insofar as that the creep resistance, measured on a 1.4 mm thick cold-rolled sample as elongation A 8 o at 580 ° C. and even under a one hour higher load of 200 MPa, is given with a value of about 0.003% also due to its excellent processability and does not require any additional process steps during production, ie no additional curing heat treatment is necessary to adjust the particularly good mechanical properties.
• the frame can be bent directly from the cold-rolled state.
• the mechanical properties are as they are previously described. she shows furthermore a long-term stability of its thermal properties according to the needs.
• the technological properties required for use as a material, in particular for horizontal frame parts for shadow masks, can be set using the iron-nickel alloys according to the invention, the composition with regard to the contents of Ni, Mo, Cr and C being able to be selected such that the desired coefficient of thermal expansion and mechanical properties.
• a further preferred composition E3 of the alloys according to the invention for use as a material for the horizontal frame, for example of a screen contains, in addition to the contents (in mass%) of 35 to 38% Ni, 0.7 to 1.1% Mo, ⁇ 0, 2% Cr and moreover 0.08 to 0.12% C and max. 1% Mn, max. 1% Si, max. 1% Nb and usual manufacturing-related additions in only a very small amount.
• the thermal expansion coefficient between 20 and 100 ° C with the low value of about 2.0 x 10 "6 / K is almost comparable to the expansion coefficient of the previously used iron-nickel alloy T2 in the prior art, which in addition to iron and about 36% Ni
• the improvement in the mechanical properties necessary for the application is achieved with alloy E3 according to the invention, in particular in that the creep resistance, measured on a 1.4 mm thick cold-rolled sample, is an elongation A ⁇ o at 580 ° C.
• the alloy E3 according to the invention is characterized by excellent processability and does not require any additional process steps during production, ie no further hardening heat treatment is necessary to adjust the particularly good mechanical properties , as is the case with ⁇ '-excretion hardenable alloys would be necessary.
• the frame can be bent straight from the cold rolled state. The mechanical properties are as they were before have been described. It also shows the long-term stability of its thermal properties that meets the needs.
• a further preferred composition E4 of the alloys according to the invention for use as a material for the vertical frame, for example of a monitor contains, in addition to the contents (in mass%) of 35 to 38% Ni, 0.4 to 0.8% Mo, 0.1 up to 0.3% Cr and moreover 0.08 to 0.12% C and max. 1% Mn, max. 1% Si, max. 1% Nb and usual manufacturing-related additions in only a very small amount.
• the thermal expansion coefficient between 20 and 100 ° C with the low value of about 1.8 x 10 "6 / K is almost comparable to the expansion coefficient of the previously used iron-nickel alloy T2 in the prior art.
• the improvement in mechanical properties necessary for the application is also achieved with the alloy E4 according to the invention, in particular insofar as the creep resistance, measured on a 1.4 mm thick cold-rolled sample as elongation A ⁇ o at 580 ° C. and at a higher load of 200 MPa for one hour, has a value of approximately 0.
• the alloy E4 according to the invention is also distinguished by excellent processability and does not require any additional process steps during production, ie no further hardening heat treatment is necessary to adjust the particularly good mechanical properties.
• the frame can be bent directly from the cold-rolled state
• the mechanical E Properties are given in this state as described above. It also shows the long-term stability of its thermal properties that meets the needs.
• Table 1 Mechanical properties proof strength, tensile strength, elongation at break at 580 ° C, determined in the hot tensile test, as well as the creep strength at 1 h at 580 ° C under a load of 138 MPa or 200 MPa and the thermal expansion coefficients of the alloys E1, E2 according to the invention, E3 and E4 compared to the alloys T1 and T2, which correspond to the prior art.
• the test specimens were made from 1.4 mm cold-rolled strip.
• Table 2 Exemplary chemical compositions of the alloys E1, E2, E3 and E4 according to the invention compared to exemplary compositions of alloys T1 and T2 which correspond to the prior art.
• cobalt in predetermined contents in percentage by mass
• Preferred additions of cobalt (in% by mass) are between 0.5 and 7%, the nickel content having to be set accordingly.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Electrodes For Cathode-Ray Tubes (AREA)
• Laminated Bodies (AREA)
• Heat Treatment Of Steel (AREA)
• Heat Treatment Of Sheet Steel (AREA)

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• 1999
  • 1999-09-17 DE DE19944578A patent/DE19944578C2/de not_active Expired - Fee Related
• 2000
  • 2000-08-03 EP EP00953149A patent/EP1212474B1/de not_active Expired - Lifetime
  • 2000-08-03 AU AU65699/00A patent/AU6569900A/en not_active Abandoned
  • 2000-08-03 DE DE50003135T patent/DE50003135D1/de not_active Expired - Lifetime
  • 2000-08-03 ES ES00953149T patent/ES2203503T3/es not_active Expired - Lifetime
  • 2000-08-03 CN CNB008108447A patent/CN1173063C/zh not_active Expired - Fee Related
  • 2000-08-03 JP JP2001525404A patent/JP3805675B2/ja not_active Expired - Lifetime
  • 2000-08-03 WO PCT/EP2000/007532 patent/WO2001021848A1/de active IP Right Grant
  • 2000-08-03 KR KR10-2002-7003533A patent/KR100502818B1/ko not_active IP Right Cessation
  • 2000-08-03 PL PL00357823A patent/PL195525B1/pl not_active IP Right Cessation
  • 2000-08-03 AT AT00953149T patent/ATE246266T1/de not_active IP Right Cessation
  • 2000-09-16 TW TW089119073A patent/TWI229135B/zh not_active IP Right Cessation
• 2002
  • 2002-12-12 HK HK02108994.7A patent/HK1049188B/zh not_active IP Right Cessation

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