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Tungsten Carbide Coated Tools Magnetization Process

Category: Tungsten Information
Published on 29 April 2015

Magnetization process is a method that place the tungsten carbide coated tools which containing magnetic element on the high-intensity pulsed magnetic field, the tool generates internal grain magnetostrictive effect under an alternating magnetic field, so as to cause lattice mobile and even cause changes in the internal structure of tungsten carbide coated tools surface residual stress generated in the manufacturing process to ease and release, reducing redistribution tool coating, grinding and stress and stress generated in use, enhanced blade chipping capacity, improve tool life, reducing tool changes and downtime, increasing the stability of tungsten carbide coated tools and devices, and to improve the finish of the workpiece surface. When cutting, cutting force and cutting temperature significantly reduced, thereby the life span of tungsten carbide coated tools after the magnetization process has improved significantly.
 

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How to Distinguish Tungsten Rod From Tungsten Gold Rod?

Category: Tungsten Information
Published on 29 April 2015
A new word "tungsten gold rod" has now been increasingly heard among the chain of economic distribution in the tungsten market. Here are three most frequent cases concern the so called "tungsten gold rod".
 
1) Metal tungsten, which is in fact the pure tungsten or tungsten alloy contained various elements, is mistakenly titled as "gold tungsten". 
2) Certain metal with high proportion, eg. lead, is faked as "gold tungsten" with much lower cost than that of tungsten.  
3) Tungsten that contains gold. 

Tungsten Rod

Category: Tungsten Information
Published on 29 April 2015
Tungsten rod, which includes tungsten bar, tungsten steel bar and sintered tungsten rod, is mainly used in the following areas:
 
  • Turning tool bit for processing; tungsten filament of lighting equipments; variety of heat conductor. 
  • Car bent axle; bits and pieces of cylinder barrel; ingredients for forging heat-resistant steels.
  • Manufacturing of gun, artillery, rockets, satellite, aircraft and ship.
 
Tungsten rod has a reputation of good wear resistance, high hardness after quenching and tempering and good performance under the high temperature.
 
Chinatungsten offers customized pure tungsten rods with good design and appropriate size.
 
 
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A Method of Tungsten Target Manufacture

Category: Tungsten Information
Published on 28 April 2015
This is an invented way of tungsten target manufacture which involves the following procedures. 
 
  • Machine the surface of tungsten target blank.
  • Place the machined blank into the vacuum bag and then drain away the vacuum.
  • Forge the blank in the vacuum bag.
  • Calendar the forged blank.
  • Cool and remove the vacuum bag.
 
This way is mold-free and can effectively defend the surface of blank from cracking and oxidizing while processing. The structure of tungsten target made by this way is well-distributed with suitable grain size that sputtering target required. What is more, this sort of tungsten target can be processed with ease under low scrap rate. The method is particularly in need when manufacture large-sized tungsten target. 
 
 
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The Type and Application of Tungsten Needle

Category: Tungsten Information
Published on 28 April 2015
Cerium tungsten electrode:
Cerium tungsten electrode is an environmental friendly product for it has no radioactive contamination. With small current the cerium tungsten electrode can do arc striking easily and its arc current is also low. Under the  condition of  d-c low current, cerium tungsten electrodes enjoy a tremendous popularity and are of  more superiority being applied in welding of pipes and small parts, intermittent welding and specific welding.
 
Thorium tungsten electrode:
Thorium tungsten electrodes are widely used in the America and some other countries for its excellent comprehensive purposes. One of its advantages is the sustaining capacity for overload current. However, because of slight radioactive contamination, thorium tungsten electrodes are partly limited in some fields. The main application of thorium tungsten electrode is d-c welding between carbon steel, stainless steel, nickel alloys and titanium.
 
Lanthanum tungsten electrode:
The welding capacity of lanthanum tungsten electrode is very good and its conductive property is thought to be the most match to that of 2% thorium tungsten electrode. With no radioactive harm, this sort of electrode is very user-friendly that an electric welder can easily use this convenient alternative without changing any operating procedure. So in Europe and Japan, lanthanum tungsten electrode has being the most popular alternative to 2% thoriated tungsten electrode. Lanthanum tungsten electrode is mainly used in d-c welding but also do well in a-c welding.
 
Zirconium tungsten electrode:
Zirconium tungsten electrodes do well in a-c welding with its end shaped a round ball and process more stable arc than pure tungsten electrode. There are no other alternatives to match expecially to its excellent work under the high load. Zirconium tungsten electrodes also has a reputation for its corrosion resistance. They are mainly used in a-c welding of magnesium, aluminum and its alloys.
 
Pure tungsten electrode:
Pure tungsten electrode is the cheapest kind among all the types, suitable for a-c welding of magnesium, aluminum and its alloys.
 
Yttrium tungsten electrode:
During the process of welding, yttrium tungsten electrode can be compressed to a large extent with slender arc beam. The fusion penetration peaks under the medium and large current. It's now mainly applied in military and aerospace fields.
 
Composite electrode:
Composite electrode is combined with more than two rare earth oxides which complement each other, pomoting the welding performance.
 
 
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Advantages of Tungsten Carbide Cutting Tools for Physical Vapor Deposition Method

Category: Tungsten Information
Published on 28 April 2015

There are many tungsten carbide cutting tools coating preparation methods, vapor deposition is the main method of preparing tungsten carbide cutting tools coating which divided into vapor deposition comprises physical vapor deposition (PVD) and chemical vapor deposition (CVD). Compared with the CVD coating technology, PVD coating technology has the following advantages:

1. PVD coating depositing a low temperature, can be 200 ~ 600 ℃ and other superhard TiN coating deposition below, it will not reduce the bending strength of the original base material, between the coating and the substrate does not produce η phase, so no special carbide material, expanding the range of applications;

2. PVD coating has a fine structure, the internal compressive stress in the coating, anti-crack growth;

3.PVD coating can coate the surface smoothly, more effective than the CVD coating to prevent cross crack rake face, but also can reduce the friction coefficient;

4.Useing the sharp edge of the tool as a matrix which is very important for high-speed cutting.
 

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Tungsten Carbide Cutting Tools Coating Substrate Graded

Category: Tungsten Information
Published on 28 April 2015

The bonding strength of tungsten carbide cutting tools coating and tungsten carbide substrate is the key factor in tungsten carbide cutting tools life. Tungsten carbide cutting tools coating must be combined with suitable tungsten carbide substrate to achieve the desired performance.Due to the different thermal stress and thermal expansion between materials, the coating material is generally brittle crack more easily to the surface of the coating matrix expansion during cooling.

In order to prevent it and contribute to achieving high performance of tungsten carbide cutting tools, tungsten carbide substrate can be a gradient process. Because of its good toughness can absorb energy and thus crack can effectively prevent cracks extend to the inside of the alloy, improve the life of tungsten carbide cutting tools.


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Flexible Coating Process of Tungsten Carbide Cutting Tools

Category: Tungsten Information
Published on 28 April 2015

Tungsten carbide cutting tools coating process flexibility is an important trend of tungsten carbide cutting tools development. From the 1960s to now, tungsten carbide cutting tools coating technology has been developed over 50 years, people have been committed to finding the best surface modification technology to improve tungsten carbide cutting tools life spans.

Since the single coating can not meet the growing complexity of modern machining, the diversified technology portfolio coating of carbide cutting tools have come into being. One of them PVD coating technology is complex, in addition to CVD and PVD processes combined are diverse coating process is an important direction. Currently abroad has grown to 10 in the base coat layer or more layers, each thinner thickness, quality of tungsten carbide cutting tools getting better. 50% -200% general multilayer coating tool life than a single coat high.
 

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Tungsten Needle

Category: Tungsten Information
Published on 28 April 2015
Manufactured under the glow discharge condition by carbonyl tungsten vapor, tungsten needle is an elongated-structure product made of pure tungsten or tungsten alloy. Tungsten needle processes many advantages like high temperature resistance and good electrical conductivity. Under 1500 ° K  indoor substrate temperature, the length of tungsten needle will grow but,  when the temperature is above or below 1100 ° K, the form and crystalline state of the needle top will change. At low temperature, the shape of agglomerated tungsten particles looks like branches while at higher temperature it resembles beard.
 
Tungsten needles can be used as apparatus probes or electrode materials in argon-arc welding technology. They are widely applied in the surface of carving metal and cutting process of collodion particles. Since the pin is very fragile, it is easily to be bent or broken and manual operation is advised in the process. 
 
Classified by the shape difference, tungsten needle can be divided into round rod and pointed needle. According to the production process, there are two ways to manufacture, namely metal injection molding process and wire-drawing molding process.
 
 
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Tungsten Target

Category: Tungsten Information
Published on 28 April 2015
Tungsten target is mainly used in various fileds including aerospace, rare earth smelting, electric light, chemical equipment, medical equipment, metallurgical machinery, smelting equipment and petroleum and so on. After being sprayed and sintered, tungsten target processes certain features with density of more than 99%, average transparent grain diameter of more than 100um,  oxygen content of  less than 20ppmor and deflected wrestling strength  of about 500Mpa. The effort to increse the production of unprocessed metal powder and to enhance the sintering ability will make it possible to keep the cost of tungsten target at a low price. Sintered tungsten target has higher density with a transparent framework which the traditional way of pressing and sintering can not match. What is more, the particulate matter will largely reduce as the deflected wrestling strength is significantly enhanced.

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