Some standard content:
UDC669.38-426:621.38.032
National Standard of the People's Republic of China
GB11248—-89
Downgraded to SJ/T11064-96
Dumet.wire
Published on March 31, 1989
Published by the State Bureau of Technical Supervision
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Implementation on January 1, 1990
National Standard of the People's Republic of China
Dumet Wire
Dumet Wire
1 Subject content and scope of application
GB11248—89
This standard specifies the brand, specification, structure, technical requirements, test methods, inspection rules, packaging, storage and transportation of Dumet Wire. This standard applies to Dumet wire (hereinafter referred to as "wire" or "wire material") with a certain linear expansion coefficient (see Appendix A) and sealed with soft glass for electronic devices, electric light source devices, etc. 2 Brand, specification and structure
2.1 The brand of the wire is DMS.
2.2 The specifications of the wire are: minimum diameter 0.15mm, maximum diameter 1.00mm. 2.3 Structure of the wire: The cross section is shown in the figure.
Schematic diagram of cross-sectional structure
a-Surface treatment layer (a mixture of phosphate + copper oxide) ib-Pot layer: c-Diffusion layer interface d-Iron alloy core 3 Technical requirements
3.1 Chemical composition
The chemical composition of the copper coating and core metal of the wire shall comply with GB467 "Electrolytic Copper" and G Bn104 "Dumet Wire Core Alloy" regulations. 3.2 Copper content ratio
The copper content ratio of the wire is 21% to 30%.
3.3 Copper layer thickness ratio
The copper layer thickness ratio of the wire should be less than 2.5:1,
3.4 Sealing performance
After the wire is sealed with the soft glass, cracks, longitudinal continuous bubbles (ie "air lines") and dense bubbles caused by the wire material shall not be generated at the seal. 3.5 Airtightness
The wire material shall not leak during the airtightness test. 3.6 Size
3.6.1 The diameter of the wire and its allowable deviation and roundness shall comply with the provisions of Table 1. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 24, 1989 YYKAONYKCa
1990-0 1-01 Implementation
Diameter range
0.15~0.35
0.40~0.60
GB11248—89
Diameter interval
Diameter tolerance
Each wire coil shall be wound with wire segments of the same diameter. Each wire coil shall not exceed three wire segments. The minimum weight of each wire segment shall comply with the provisions of Table 2 Table 2
Diameter range, mm
0.15~0.35
0.40~0.60
0.65~1.00
3.7 Mechanical properties
The tensile strength and elongation of the wire shall comply with the provisions of Table 3. Diameter range, mm
0.15~0.35
0.40 or above
3.8 Surface quality
Tensile strength, MPa(kgt/mm)
441~637(45~65)
Minimum weight of each wire segment, 8
Minimum elongation, %
3.8.1 The surface color of the wire should be orange-red to dark red, of which the wire below 00.60 is bright red to dark red, and the wire greater than @0.60 is orange-red. The color of the same coil of wire should not be obviously uneven. 3.8.2 The surface of the wire should be smooth, clean, and should not be stained by any dirt, dust, grease, etc. There should be no obvious scratches, whitening, longitudinal dark stripes (i.e. "black lines") and continuous spots. The surface treatment layer and the copper layer should be firmly bonded, and the copper layer and the core wire should be firmly bonded. A small amount of spots, scratches and other local defects that do not affect the use are allowed. Each coil of wire should be evenly arranged according to the width of the coil groove, the free end of the wire should be fixed, and the outermost wire should be 1 to 2 mm lower than the edge of the coil. 3.9 Special requirements
Special requirements for wire can be negotiated by the supply and demand parties. 4 Test method
4.1 According to the requirements of Article 3.1, the chemical composition of the copper coating and core metal of the wire shall be analyzed according to GB471 "Standard Method for Chemical Analysis of Copper" and GB223.1223.7 "Chemical Analysis Method for Steel and Alloys" respectively. 4.2 According to the requirements of Article 3.2, the copper content shall be determined according to "II. Method" in SJ/Z328 "Analysis Method for Copper and Nickel in Copper-plated Iron-Nickel Alloy Wire". The copper % in its calculation formula is the copper content of the wire. 4.3 According to the requirements of Article 3.3, the cross-sectional specimen of the tested wire is prepared by the ordinary metallographic specimen preparation method, and the maximum and minimum thicknesses of the wire copper coating are measured under a 50-100x microscope. The copper layer thickness ratio is calculated according to the following formula: Copper layer thickness ratio -
Maximum thickness of copper coating
Minimum thickness of copper coating
4.4 According to the requirements of Article 3.4, the sealing performance test is carried out in accordance with Appendix B "Dumet wire sealing test method" of this standard. 4.5
(1)）
Perform an airtightness test according to the requirements of 3.5: seal the sample into one end of a soft glass tube (shell), and evacuate the other end until the vacuum degree in the tube (shell) reaches 13.3uPa (10-Torr). Seal it and immediately test it with a spark leak detector, and then place it for 24h, 48h, and 72h for testing respectively. 4.6 According to the requirements of 3.6, the size of the wire is tested with a first-level micrometer, and the number of wire segments and their weight are observed and weighed during the rewinding process of the tested wire material.
4.7 According to the requirements of Article 3.7, select a tensile testing machine with an appropriate range (with an extension scale) and stretch the sample at a tensile speed of no more than 60mm/min until the sample breaks (the fracture is in the middle of the sample or close to the middle. If the fracture is in the upper or lower clamp or close to the upper or lower clamp, another sample must be taken and retested). Read the tensile force and elongation readings on the tensile scale and extension scale respectively, where the elongation reading is the elongation of the sample. The tensile strength is calculated as follows: P
Where: a%—-tensile strength, MPa (kgf/mm2×9.8); Pe tensile force, N (kgf×9.8);
..··(2)
F. -—Original cross-sectional area of the sample, mm.
4.8 According to the requirements of Article 3.8, the surface quality of the wire is checked by naked eyes and hand feeling. The bonding state of the copper layer and the core wire is observed by naked eyes or a 5x magnifying glass after breaking the sample with a needle-nosed pliers. 5 Inspection rules
5.1 The wire is inspected by the inspection department of the supplier to ensure that the wire material meets the card standard and fill in the quality certificate. 5.2 The buyer shall accept the wire material according to this standard within two months from the date of receipt. If the acceptance result does not meet the standard written in the quality certificate, it is still unqualified after the appraisal of both parties, then it is unqualified. 5.3 The size and surface quality shall be 100% inspected in accordance with the provisions of Articles 2.6 and 2.8 of this standard. If it does not meet the requirements, it is a non-conforming product. 5.4 Copper content and mechanical properties shall be inspected in accordance with Articles 2.2 and 2.7 of this standard. 10% of the submitted batch shall be sampled. If there is an unqualified item, the unqualified item shall be doubled for inspection. If it is still unqualified, it is a non-conforming product. 5.5 The chemical composition, copper layer thickness ratio, sealing performance and airtightness performance shall be carried out according to the provisions of 2.1, 2.3, 2.1 and 2.5 of this standard. The supplier shall conduct 1 to 2 routine tests every year according to the core alloy furnace number and keep records for preparation. After identification and consultation by both parties, one or all of the items shall be retested. If unqualified, the unqualified items shall be double-sampled. If they are still unqualified, they shall be considered unqualified products. 6 Packaging, marking, storage and transportation
The wire shall be wound on a wire reel with an inner diameter of not less than 80mm. Wires with an inner diameter of Φ0.65 or more can be wound into wire reels or rolls according to user requirements. After the wire surface is sealed with a 6.1
sticker, appropriate internal and external packaging shall be carried out. All packaging shall prevent the wire from loosening (reeling), scratching, moisture and contamination. 6.2 Each batch submitted shall be accompanied by a quality certificate, and each reel (roll) shall be accompanied by a label or certificate of conformity, which shall indicate: Dumet wire and brand;
b. Diameter:
c. Weight,
d. Inspection department's conformity stamp:
Date of production;
Number of this standard and name of manufacturer.
6.3 After packaging, Dumet wire shall be stored in a container or room with a relative humidity not exceeding 65% and free of harmful gases such as acid and alkali. 6.4 The outer packaging of Dumet wire should be marked with "Do not throw" and "Prevent moisture". During transportation, it should be protected from severe impact and erosion by rain, snow, alkaline and other harmful substances.
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GB11248—89
Appendix A
Dumet wire linear expansion coefficient
(reference)
A1 Relationship between Dumet wire radial expansion coefficient α (20～400℃) and copper content of wire and nickel content of core material The relationship between Dumet wire radial expansion coefficient α (20～400℃) and copper content of wire and nickel content of core material is shown in Table A1. Table A1
4 diameter, ×10-7/K
Copper content of wire, %
A2 Dumet wire axial expansion coefficient αm
Nickel content of wire core material, %
When the temperature is 20~00℃, the axial expansion coefficient α of Dumet wire is (60~65)×10-1/KAppendix B
Dumet wire fusion sealing test methodbzxz.net
(reference)
Test equipment, instruments, samples, materials
Fuse sealing torch, rotating shaft mechanism, oven, 5x magnifying glass, sample, soft glass tube, hydrofluoric acid solution. Among them: soft glass tube: outer diameter 2.6±0.2mm, inner diameter 0.60±0.01mm, length 10±1mm. Hydrofluoric acid solution 1+99 (volume ratio).
Specimen specifications: 00.5, length 50mm.
B2 Test method
B2.1 Pretreatment of soft glass tube: Immerse the soft glass tube in a hydrofluoric acid solution, wash it with purified water, spin it dry, and dry it in a 70-80°C oven.
B2.2 Put the purified soft glass tube on the Dumet wire and fix it on the transfer mechanism. Rotate it at a certain speed while heating the glass tube to 700-800°C with a flame. The flame is stable during heating. The flame gradually moves from one end of the glass tube to the other end, so that the wire and the glass are all 4
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GB11248-89
fused and bonded, then slowly cool to the softening point of the glass, and then naturally cool to room temperature. Use a 5x magnifying glass to observe the fusion seal. Additional notes:
This standard was drafted by Factory 770.
The main drafter of this standard: Zhang Yongxing.
This standard replaces SJ318-72 "Copper-plated iron-nickel alloy wire": YYKAONKAa
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