Copper Tungsten Cuw or Wcu Heat Sinks and Electronic Packaging Materials

Product Description

Kefeng's Copper tungsten (CuW, WCu) has been regarded as a highly conductive and erasion resistant composite material that is extensively used as copper tungsten electrodes for EDM machining and resistance welding, electrical contacts in high voltage applications, and heat sinks and other electronic packaging materials in thermal applications.


 

The most common tungsten/copper ratios are WCu 70/30, WCu 75/25, WCu 80/20 and 90/10.  The range of available compositions is from Cu 50 wt.% to Cu 90 wt.%. Our tungsten copper product range includes copper tungsten rod, foil, sheet, plate, tube, tungsten copper rod and machined parts. We are capable of producing copper tungsten plates and sheets with a range of thickness from 0.05mm to 50mm. We also offer copper tungsten rods with diameters from 1.0mm to 127mm or more.

As an ISO-accredited tungsten alloy products manufacturer, Kefeng is capable of offering various types of tugnsten copper that meet a consistently high standard. We have the capacity to provide a reasonable lead time and handle large-volume sale.  We produce various sizes, shapes and
inished parts in forms as wire, rod, bar, sheet, ,strip, foil, sheet, plate, tubing, blanks, semi-finished and custom finished parts or according with
ustomer's drawing paper.

Certification: Corporation is ISO9001 Certified, SGS approved and has been manufacturing the highest quality tungsten alloy metals for over 28 years.

Product mechnical and physical properties

Composition	Density (g/cm3)	Electrical Conductivity (IACS% Min.)	Thermal Conductivity (W/m-K-1)	Hardness (HRB Min.)
WCu 70/30	14.0	52.1	230	95
WCu 75/25	14.8	45.2	220	99
WCu 80/20	15.6	43	200	102
WCu 90/10	16.75	32.5	180	107

They also possess good thermal and electrical conductivity.  We, Kefeng Powder Metallurgy Co., manufactures and supplies DRC Conflict Free material only.


Characteristics and features
 

When processing the copper tungsten alloy products, the purity tungsten is pressed, sintered and infiltrated by the oxygen-free copper after
the consolidating steps which represents a homogeneous microstructure and low level of porosity. The combination of copper's conductivity with tungsten's high density, hardness and high melting point produces a composite with many preeminent properties of both elements.  Copper-infiltrated tungsten boasts such properties as high resistance to high-temperature and arc-erosion, excellent thermal and electrical conductivity and a low coefficient of thermal.  The physical and mechanical properties and melting point of tungsten copper material will be positively or oppositely affected by varying the amount of copper tungsten in the composite.  As the copper content gradually increases, the electrical and thermal conductivity and thermal expansion exhibit a tendency of being stronger.  But the density, electrical resistance, hardness and strength will be weakened when infiltrated with less amount of copper. In the end, an appropriate chemical composition is the utmost importance when considering tungsten copper for specific application need.

 

1. Low thermal expansion
2. High thermal and electrical conductivity
3. Low consumption
4. High arc resistance

Application
 

The use of Tungsten copper (W-Cu) has greatly increased in many fields and applications due to its unique mechanical and thermophysical properties. Tungsten copper materials exhibit high outstanding performance in the aspects of hardness, strength, conductivity, high temperature, and arc erosion resistance. It has been extensively used for the production of electrical contacts, heat sinkers and spreaders, die-sinking EDM electrodes and fuel injection nozzles.

Copper Tungsten Electrode

Tungsten copper is widely used in applications such as electrodes for sinker electrical discharge machining (EDM) and resistance welding. Copper tungsten EDM electrode is capable of machining hard refractory alloys such as titanium carbide and tungsten carbide. Copper tungsten can yield a better MMR (material removal rate) at a low level of TWR (tool wear rate) in comparison to copper, graphite, and other common materials electrodes. In addition, copper tungsten electrodes will become more desirable to utilize if the machining work requires high accuracy in dimension or an intricated geometry.

Therefore, copper tungsten is a relatively cost-saving and efficient option with respect to overcoming machining difficulties caused by a high melting temperature, and high thermal shock and abrasion resistance. Tungsten copper composites are also a preferred gourp of material in resistance welding electrodes. This is both because of the excellent conductivity of copper and the high melting point and the corrosion resistance of tungsten.

Copper Tungsten Heat Sink And Packaging Material

Copper tungsten is a promising material commonly utilized in integrated circuits and high-power microelectronic devices as heat sink and packaging materials. Tungsten copper alloy exhibited superior thermal conductivity and machinability. Most importantly, copper tungsten composites process a relatively low and tailorable coefficient of thermal expansion. In addition, the CTE range of copper tungsten composites overlapped with that of semiconductor materials like SiC and ceramics substrate materials like Aluminum oxide (Al2O3) and Beryllium oxide (BeO). Therefore, WCu composite can be tailored to a close CTE to each material and efficiently prevent them from the damage of thermal stress fatigue.

Copper Tungsten Contact

Copper tungsten contact presents high closing and breaking performance in applications of high voltage circuit breakers, no matter what the interrupting medium is, e.g. an oil, vacuum, SF6 gas, or air environment. When the low melting point copper particles melt and evaporate from the tungsten skeleton, those particles absorb large amounts of heat generated by the electrical arc. Apart from the cooling effect of copper tungsten, the high melting point tungsten particles also take credit for the superiority of copper tungsten contact by offering an unmatchable resistance to arc-erosion and a high density.

Copper Tungsten Nozzle

Copper tungsten (Cu W) has also been proven to be one of the preferred materials for aviation and aerospace applications. Tungsten has a low thermal expansion and a high melting point. At the same time, the copper infiltrates contribute an exceptional transpiration cooling effect to the copper tungsten components when the working temperature is from 2000^oC to 3300 ^oC.  Therefore, the infiltrated tungsten provides superior resistance to thermal shock. It is critical to ensure the complex machined component maintains a stable condition and accurate dimension. These advantageous properties are why copper tungsten is widely used to make high-temperature resistance components such as the nozzles and throats of missiles and rockets.

 

1. Resistance welding electrodes
2. Circuit breakers (air or oil immersed)
3. Arcing tips
4. Heavy-duty contactors
5. EDM electrodes
6. Make-and-break contacts
7. Relays/switches

Technical parameters

Materials	Wt% Tungsten Content	Wt% Copper Content	Grade	RWMA Class	Density (g/cc)	Electrical Conductivity (%IACS)	Hardness (HRB)
W70Cu30	70	Balance	A5WC	10	14.18	47-52	88-95
W75Cu25	75	Balance	A10WC	11	14.80	42-50	96-99
W80Cu20	80	Balance	A30WC	12	15.60	41-49	99-104

Note: The values are typical and not to be used for specifications.



For three decades Kefeng Powder Metallurgy has pioneered and produced the best tungsten alloy metal solutions for the world's products, applications and industries.

-Our products are subjected to rigorous physical testing, including density, tensile, yield strength,conductivity, elongation and hardness.

-Our products are identified at all stages of the production process and are thoroughly analized and checked before delivery.

-Our products can be supplied with full verification in accordance with specifications,whatever
Chemically, mechanically or physically.

At Kefeng Metallurgy,our expert and equipment are committed to providing the best tungsten alloy
Refractory metal solution that performs our customer's requirements and improving overall quality.