Contact: Manager Li
Tel：0086-15867586880
Tel：0086-574-56180128
Fax: 0086-574-56180129
Website: www.nbyldg.com
Email: jacky@nbyldg.com
Address: No. 195-207, Gongmao 2nd Road, Industrial Park, Jishigang Town, Haishu District, Ningbo City, Zhejiang Province
Features
Tungsten powder and copper powder are sintered and infiltrated copper-tungsten alloy contacts through mechanical mixing and hydraulic forming of tungsten skeleton. Low thermal electron emission capability; high electrical conductivity and thermal conductivity, the content of tungsten can vary from 50% to 90% according to different use conditions, and the mechanical and physical properties of the material can be controlled and adjusted by changing its composition ratio.
Integral contacts are made by infiltration welding or integral sintering of tungsten skeleton, mainly used in medium and high voltage circuit breakers, load switches, transformer tap changers and other medium and high voltage electrical switches.
Chemical composition of copper tungsten electrical contact material | ||||||
Mark | Chemical composition % | |||||
W | Cu | Ni | Fe | C | Sum of impurities | |
≤ | ||||||
CuW50 | Margin | 50±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW55 | Margin | 45±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW60 | Margin | 40±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW65 | Margin | 35±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW70 | Margin | 30±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW75 | Margin | 25±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW80 | Margin | 20±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW85 | Margin | 15±2 | 1.0 | 0.10 | 0.15 | 0.5 |
CuW90 | Margin | 10±2 | 1.0 | 0.10 | 0.15 | 0.5 |
Mechanical and physical properties of copper-tungsten electrical contact materials | ||||||
Mark | Mechanical and Physical Properties | |||||
Density≥g/cm3 | Resistance Rate≤ μΩ·cm | Hardness HB≥ | Flexural strength≥MPa | Thermal conductivityW/(m.K) | Cu (Volume fraction）% | |
CuW50 | 11.85 | 3.2 | 115 | - | 200 | 68.4 |
CuW55 | 12.30 | 3.5 | 125 | - | - | 64.0 |
CuW60 | 12.75 | 3.7 | 140 | - | 195 | 59.1 |
CuW65 | 13.30 | 3.9 | 155 | - | - | 53.9 |
CuW70 | 13.80 | 4.1 | 175 | 790 | 175 | 48.2 |
CuW75 | 14.50 | 4.5 | 195 | 885 | - | 42.0 |
CuW80 | 15.15 | 5.0 | 220 | 980 | 160 | 35.2 |
CuW85 | 15.90 | 5.7 | 240 | 1080 | - | 27.7 |
CuW90 | 16.75 | 6.5 | 260 | 1160 | 150 | 19.4 |
