Manufacturing Process of Tungsten Carbide

Preface: Tungsten Carbide, also referred as to Cemented Carbide, is manufactured by powder metallurgy methods. The tungsten carbide powders are mixed with a binder metal, which is normally cobalt or nickel in 3-28%, compacted in a die and then sintered in a furnace generally between 1350-1450︒C.

In additional to the traditional sintered carbide, CYC is also able to offer the Pre-forming parts which is suitable for complicate shapes or small batches which is hard to afford to make a new die.

By our variety of forming routes, CYC is able to produce the tungsten carbide parts up to 500 mm in length and up to 200 mm in diameter, with minimum order quantity starts from 1 pc.

1.Grade Design grade design

CYC grades are designed upon application.Our process start with powder mixing.Raw materials includes WC,Co and other elements.

2.RTP Ball milling ball milling

Wide variety of CYC designed grades from superfine to coarse grain size are available.

Grade with different grain size are ball-milled,sieved,granulated in separated systems to avoid grain contamination.

3.Spray Drying spray drying

Spray drying process makes the powder into superior hmogeneous particle sizes with good flowability and as a result,the dimension variation on sintered blank is much smaller.

4.1.Extrusion extrusion

The rods with or without axial holes,including helical types,are formed by extrusion pressing.

Our automatic extrusion systems and technical know-how helps to achieve consistent geometries.

4.2.Direct Pressing extrusion

Due to our comprehensive and variable forming solutions,we are able to produce the various type of rods by extrusion pressing,and also the direct pressing of blanks such as rotary bur blanks,disc cutters etc.

Special developed grades upon application,high precision press tools designed built in house,offer tighter tolerance control,which ensures higher performance of products delivered to you.

5.1.Preforming preforming

Turning,milling,drilling,cutting can be applied on green blanks in order to preform the part to net shape according to customer's drawing,which can greatly enhance customer's productivity for special and complicated tools.

5.2.Drying Process drying process

This process removes the plasticizer in the blanks using a vacuum drying furnace.

6.Sintering sintering

Green blanks are sintered at temperature around 1400℃ (cobalt melting) to become super hard and tough.

CY utilizes HIP (hot isostatic pressure) sintering furnace which gives carbide maximu, toughness to meet the most critical working applications.

7.Machining machining

Most of the rod blanks need to be centerless ground,to achieve precision tolerances h6/h5.

In addition,length cutting,chamfer,slot,cylindrical grinding service can be offered upon customer request.

8.Inspection insepection

The key properties are monitored from raw material,RTP and raw sintered parts in our laboratory for quality and performance guarantee.

Diameter,roundness,run-out,roughness,pitch,TK,concen tricity,inspection will be done before the parts are shipped to the customer.