Tungsten Carbide Rod Sintering

Sintering is the last process of tungsten carbide rod extrusion method. It affects the density and chemical properties of the products in a large degree. It also decides the performance and quality of the products. Due to a lot of binder is being used in the process of tungsten carbide rod extrusion, the shrink rate is very large during the sintering (it can reach to 12%-18%). So the control of shape and dimension is a big problem. And the tungsten carbide rod extrusion method makes it become a shape piece, it becomes more significant.

Also, the sintering temperature, atmosphere and the heating rate have a great influence on the performance and quality of the product. Currently, tungsten carbide rod is being processed via vacuum sintering + HIP (hot isostatic pressing) and low pressure sintering. Plasma discharge sintering (SPS), microwave sintering and some fast, low temperature sintering technology has become a new search area. 


Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

Ion gun tungsten filament (IG tungsten filament) is made of tungsten wire, which is indispensable components in scientific research and semiconductor manufacturing equipment and has been used to produce high current of H− ions and other aspects. Ion source filament owns many different types, such as single helix cylindrical filaments with one turn, flat spiral filaments, or planar filaments and so on. The major deficiency of its performance is that the energetic electrons produced by the surface of interior metal will escape. So the magneto-static fields produced by permanent magnets are designed to recapture more energetic electrons with lower number of permanent magnets to avoid this problem. To suit equipment requirements and functionalities, we modify appropriate filament configurations and specifications when we design such equipment. Tungsten is the most common functional material used to fabricate ion source filaments. Ion gun tungsten filament has some features that make it distinct from other materials.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten Carbide Rod Cold Isostatic Process

Tungsten carbide rod cold isostatic process includes pressure cutting method, wet bag method and dry bag method.
1.Pressure cutting method. First pressing the grinded carbon powder into a block and treat it with the cold isostatic process. And then carry the continuous processing. Only a small amount of plasticizer like polyethylene ethanol and paraffin are required in this process. No plasticizer is required if the pressure is high enough. The tungsten carbide rod made through this method is very rough. It needs to be processed again before it becomes a finished product.

2.Wet bag method. The mould is averagely under the same high pressure liquid (about 200MPa), the specimen size is limited by the cavity, as a result it's not suitable for mass production. This method is mainly for large diameter bar.

3.Dry bag method. This method uses different liquid as transmission medium. The mould is semi-fixed. The blanks are being adding and removing under dry condition. Due to the high degree of automation and shorter operation circle, it is suitable for mass production. 


Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn