This standard specifies the technical requirements for tungsten powder used in copper-tungsten electrical contacts for high and low voltage electrical appliances. This standard applies to tungsten powder used in copper-tungsten electrical contacts manufactured by powder mixing method, melt infiltration method or pre-burned skeleton impregnation method. This standard does not apply to tungsten powder used in copper-tungsten electrical contacts for vacuum contactors. JB/T 5336-1991 Technical requirements for tungsten powder used in copper-tungsten electrical contacts JB/T5336-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Tungsten Powder for Copper-Tungsten Electrical Contacts
Subject Content and Scope of Application
This standard specifies the technical requirements for tungsten powder for copper-tungsten electrical contacts used in high and low voltage electrical appliances. This standard applies to tungsten powder for copper-tungsten electrical contacts manufactured by powder mixing method, melt infiltration method or pre-burned skeleton impregnation method. This standard does not apply to tungsten powder for copper-tungsten electrical contacts of vacuum contactors. 2 Reference standards
GB3458
Technical conditions for tungsten powder
GB4324.1～4324.30 Chemical analysis methods for tungsten GB3249
Methods for determination of particle size of refractory metal and compound powders-Fischer's method GB1479
GB6524
GB8320
GB5314www.bzxz.net
3 Product brand
Determination of loose density of metal powders-Part 1 Funnel method-Determination of particle size distribution of metal powders-Light transmission method Technical conditions for copper tungsten and silver tungsten electric contacts
Sampling method of powder for powder metallurgy
The brand of tungsten powder for copper tungsten electric contacts is FW-C14 Technical requirements
4.1 Appearance
The appearance of tungsten powder should be uniform and dark gray, without inclusions visible to the naked eye. 4.2 Chemical composition
JB5336--91
4.2.1 Except for oxygen, iron, potassium and sodium content, the content of other impurities shall comply with the provisions of FW-2 in GB3458. 4.2.2 The oxygen content of tungsten powder shall be less than or equal to 0.20%. For tungsten powder used in the mixed powder method, it can be less than or equal to 0.25%. 4.2.3 The iron content of tungsten powder shall be less than or equal to 0.01%. 4.2.4 The sum of potassium and sodium content of tungsten powder shall be less than or equal to 0.0065%. 4.3 Physical properties
4.3.1 The average particle size and bulk density requirements of tungsten powder are shown in the table below. Manufacturing method of copper tungsten contacts
Pre-burned skeleton diffusion method
Melt infiltration method
Mixed powder method
4.3.2 The particle size distribution of tungsten powder should have actual measured data. Average particle size μm
Bulk density g/cms
4.3.3 Tungsten powder should have good infiltration for copper. The copper-tungsten contact samples prepared with it should not have a tungsten enrichment area larger than 200um. 4.4 If the buyer has special requirements, they shall be agreed upon by both parties. 5 Test method
Approved by the Ministry of Machinery and Electronics Industry on June 28, 1991 and implemented on July 1, 1992
JB5336-91
5.1 The appearance inspection of tungsten powder shall be carried out with the naked eye or with the aid of a 10x magnifying glass. 5.2 The impurities in tungsten powder shall be determined in accordance with GB4324.1~4324.30 and shall comply with the provisions of Articles 4.2.1, 4.2.2, 4.2.3 and 4.2.4 of this standard. 5.3 The average particle size of pigeon powder shall be determined according to GB3249, and the bulk density of tungsten powder shall be determined according to GB1479, which shall comply with the provisions of Article 4.3.1 of this standard. 5.4 The particle size distribution of tungsten powder shall be determined according to GB6524. 5.5 The tungsten enriched area of ​​the copper tungsten contact sample shall be inspected according to Articles 5.8 and 5.9 of GB8320, which shall comply with the provisions of Article 4.3.3 of this standard. 6 Acceptance rules
6.1 The supplier of tungsten powder shall inspect each batch of tungsten powder composed of the same mixture according to the requirements of this standard except Article 4.3.3, and fill in the product certificate and inspection form. 6.2 After receiving the tungsten powder, the demander of tungsten powder shall take samples according to GB5341, and then inspect them item by item according to this standard. If one of the test results is unqualified, double sampling shall be taken to re-inspect the item. If it is still unqualified, the batch of products shall be unqualified. 6.3 The buyer of tungsten powder shall submit a report of re-test failure to the supplier within two months after receiving the tungsten powder. If there is a dispute that requires arbitration, the arbitration sampling shall be carried out jointly at the location of the buyer of tungsten powder. 7 Packaging, marking, transportation and storage
7.1 Each batch of tungsten powder shall be accompanied by the supplier's product certificate and inspection form. 7.2 The product certificate shall indicate:
a, product name, brand, batch number;
b. Product net weight;
c. Manufacturing date;
d. Manufacturer name,
e. Inspector name or inspection department (or code). 7.3. The content of the product inspection form shall include:
a, product name, brand, batch number
b. Product net weight;
c. Product chemical composition, average particle size, bulk density and particle size distribution; d. Date of manufacture;
e, manufacturer name;
f, inspector name or inspection department (or code). 7.4 Tungsten powder should be packed into plastic bottles lined with double plastic bags, which are placed in wooden boxes and filled with soft items. Tungsten powder can also be packed into iron barrels lined with double plastic bags. The weight of each piece shall not exceed 30kg. 7.5 The product name, brand, batch number and net weight should be marked on plastic bottles, wooden boxes or iron barrels. The wooden boxes or iron barrels should also have the words or signs "moisture-proof", "fragile" and "upward". 7.6 During transportation, the product should be protected from moisture and should not be violently collided. 7.7 Tungsten powder should be placed in a dry, ventilated and acid-free and alkali-free place, and the storage period should generally not exceed half a year. Additional notes:
This standard is proposed and managed by the Guilin Electrical Science Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Beijing Electrical Engineering Comprehensive Technology and Economic Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Chen Miaonong, Zhang Changsheng and Guo Liping.
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