Copper Tungsten Manufacturer| WCu Rods, Sheets, Plates

Copper Tungsten

We are copper tungsten manufacturer in China that offers diferent shapes of copper tungsten parts. Our factory produces copper tungsten rods, copper tungsten sheets, copper tungsten flats, copper tungsten plates and fabricated copper tungsten products.

Copper Tungsten Rods

Copper Tungsten Tubes

Copper Tungsten Sheet

Copper Tungsten Plates

Copper Tungsten Disks

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All You Need to Know About Copper Tungsten

Copper tungsten (tungsten copper, CuW, or WCu) is a metal alloy with tungsten and copper. Both elements are not mutually soluble. The structure it forms is a metal matrix composite.
Copper tungsten is a perfect choice where high thermal conductivity or low thermal expansion is important.

With these unique features, copper tungsten can be used in various applications like electrodes in resistance welding, electrodes in EDM machining, switch contacts in electricity, heat sinks in semiconductors.

We have many years of production experience in turning powder into finished parts by metallurgy.

In all processes, we pay much attention to details and devote ourselves to the highest accuracy and bring our customers uncompromising quality and constant stability.

In the passages below, we will introduce copper tungsten properties, applications, production process, product classification, and points to consider when purchasing.

Copper Tungsten Properties

Composition	Cu Content %	Density g/cm3 ≥	Electrical Conductivity IACS %≥	Hardness HB Kgf/mm2 ≥
W50Cu50	50±2.0	11.85	54	115
W55Cu45	45±2.0	12.3	49	125
W60Cu40	40±2.0	12.75	47	140
W65Cu35	35±2.0	13.3	44	155
W70Cu30	30±2.0	13.8	42	175
W75Cu25	25±2.0	14.5	38	195
W80Cu20	20±2.0	15.15	34	220
W85Cu15	15±2.0	15.9	30	240
W90Cu10	10±2.0	16.75	27	260

CTE and TC

Type	Relative density, %T.D.	Coefficient of Thermal Expansion ppm/K	Thermal Conducitivity W/m.K
W90Cu	≥99	5.6~6.5	190~200
W85Cu	≥99	6.3~7.0	200~210
W80Cu	≥99	7.6~9.1	220~230
W50Cu	≥99	12.3~12.8	230~240

Copper Tungsten
Advantages

With unique features, copper tungsten is widely used in wide industries. Here we would like to list several properties.

Good machinability

Perfect electrical conductivity

High thermal conductivity

High resistance to arc erosion

Low thermal expansion

High arc resistance

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Copper Tungsten Applications

Copper tungsten is used for electrical discharge machining (EDM).

With copper’s high electrical conductivity and tungsten’s wear resistance, copper tungsten is one of the most suitable materials for EDM and ECM.

Copper tungsten can be used as electrodes for resistance welding.

Combining the good thermal conductivity of copper with the high hardness and wear resistance of tungsten, copper tungsten (Elkonite) is chosen as the welding electrode. Inserted welding electrodes or facing of electrodes.

Copper tungsten is used as arc contacts and vacuum contacts in high/medium voltage breakers or vacuum interrupters.

We produce copper tungsten materials with excellent high-temperature stability and high electrical and thermal conductivity. Choose our copper tungsten arc erosion contacts in gas-insulated and air-insulated switchgear as well as high- and medium-voltage generator circuit breakers.

Copper tungsten is applied in the micro semiconductor industry.

With high thermal conductivity and low thermal expansion, the common usage is as heat sinks, heat spreaders, spacers, tabs, shims, mounts, and pedestals in areas like High Power Semiconductor Lasers, Optical Benches, HB LEDs, fiber lasers, RF and MW amplifiers.

Copper Tungsten Production Process

From powder to finished parts, every step we care.

Production process: weighing powder, mixing powder, press powder, sintering, infiltration, machining, and inspection.
From accurately weighing raw materials and applying exacting temperatures at different stages, to precise machining and extensive quality control systems, attention to detail is key to ensuring finished copper tungsten parts meet the standards required by our customers.

Material Preparation

Our tungsten powder and copper powder are sourced from selected trustworthy suppliers. In incoming inspection, all powders are with certificates. Our inspectors double-check its purity, particle size and distribution, apparent density, and flow characteristics. Then we need to blend these two powders along with additives based on a certain ratio.

Pressing

Based on finished parts, a certain weight of the pre-mixed powder is loaded into a die cavity. The mold can be big or small which is decided by the size of the part. Normally if the size is big, we put the powder in a mold into a CIP. If it is small, we use an automatic pressing machine to press it. After pressing, copper tungsten powder forms a compact shape but is still fragile. It needs attention when handling.

Sintering

To remove blinders and lubricants, sintering in a high-temperature furnace is a must. In the sintering process, the powder particles will form metallurgical bonds, in which the refractory skeleton forms. The accuracy and time of temperature are very important.

Infiltration

In infiltration, a carefully controlled pre-cut slug of pure copper is placed on the skeleton. Under certain time, temperature, and atmospheric control, the copper slug melts and infiltrates into the “skeleton”. The infiltration makes sure the copper tungsten has an accurate composition and even inner structure.

Machining

For products with not-so-high accuracy dimension requirements, we can achieve by sintering in designed mould along with rough machining. But if there is complex and spohiscated shape, we have a full line of CNCs and conventional machining equipment to reach the most demanding designs through the most efficient production ways possible.

Tips For Copper Tungsten Machining

For the same composition, it is normal to see different appearances of copper tungsten after milling, lathe processing, and grinding.

It is normal for tungsten copper rods to have a steel (black) color after being finely ground by a coreless grinder.

After being semi-finely (coarsely) ground, it shows a copper (red) color.

Tungsten copper is easy to be processed and shape, and it can be processed by ordinary milling machines, lathes, grinders, and wire-cutting machines. The metal may be chipped due to impact or excessive processing load when making a thin wall with a sharp angle. When drilling through holes in tungsten copper, please pay attention to the feeding force when the hole is about to be drilled through to avoid chipping. With non-magnetic properties, it is important to make sure that the part is firmly fixed before working.

Tungsten copper contains most of the tungsten, which is hard and brittle, resulting in good bending strength and hardness, but the flexibility and elongation are low, so it is not suitable for bending and drawing at large angles.

Considerations When Buying Copper Tungsten

#1 Material
What is the material? Which grade? This means the content of tungsten and copper. The different ratio has different properties.
#4 Application
What is the application of the part? If you are not clear about the application, pls get to know the property requirements like density, hardness, thermal conductivity, thermal expansion, and more you know. Each application has different property requirements. And if you are not clear about these too, you can consult us and tell us what performance you want to achieve, we will give our professional and experienced advice.
#2 Dimensions
- If simple shapes like wire, or rod, we only need to know their diameter, length, tolerances,
- If sheet, plate, or cube, we only need to know its thickness, width, length, and tolerances.
- If complex shapes, we need drawings.
#5 Oxidation
Copper tungsten is easy to oxide. After cleaning, it must be dried completely. If not, it is common to see an oxidized surface. If you face the same problems, you can consult us either and we provide our professional advice to you to deal with it. It is very important to wear a plastic glove when touching copper tungsten. If not, you can find your fingerprints a few minutes later.
#3 Surfaces
- For copper tungsten sheets or plates, there are sintered surfaces, lathed surfaces, milled surfaces, and ground surfaces. The sintered surface is just after sintering and normally customers do not buy this type. But it is also the cheapest. The lathed surface is to get a thin and long sheet. The milled surface and ground surface are for the thicker plate.
- For copper tungsten rods, we offer sintered surface, machined surface, and ground surface. The differences are the surfaces and their tolerances. The later, the better surfaces and higher accuracy.
#6 Price Validity
When you come to know the prices, you must ask about the validity. Tungsten copper is an expensive metal and it varies with the material powder.
#7 Package
Copper tungsten is not brittle as tungsten. It is relatively soft because of the addition of copper. If bump against each other, it is very common to see marks and dents. We usually use thick foam to separate parts and make sure they will not bump into each other when facing violent transportation. We have cartons and wooden boxes based on customers’ choice. And after packaging, we will use iron or plastic bonds to strengthen it.

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Copper Tungsten Manufacturer