It is important that choose proper pressing process has remarkably effect on the density of tungsten skeleton and the structure of tungsten copper electrode. There are tungsten copper electrode properties under five different pressing pressures at 1300℃ as follow:

The table shows that with the increasing pressing pressure, the density and hardness of powder with same granularity is increasing, but the conductivity decreases. 

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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

Electrical Discharge Machining (EDM), in the process of machining, produces discharging spark between the tool and the work-piece constantly, which remove the material depends on part of high temperature. EDM has many advantages, such as it can be suitable for some super-hard material cutting (tungsten carbide, cubic boron nitride, HHB), and it has high machining precision.

The mechanism of tungsten copper electrode for EDM:

In the process of machining, impulsing power source linked with tungsten copper electrode and work-piece. Generally, the liquid has insulativity (such as kerosene, mineral oil). Tungsten copper electrode is controlled by automatic servo feed regulating system, which ensures the discharging gap (0.01-0.05mm). When the impulse voltage exerted between two electrodes, the liquid medium will be punctured and form discharging channel. The part high temperature melt the material and tungsten copper feed regularly so that the work-piece will be machined as request.

Tungsten Copper Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-copper.com/
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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

In last part we know that to make tungsten carbide cutting tools, we first make tungsten carbide which is a production line from tungsten ore, to sodium tungstate, then to tungsten oxide and then to carbonization. Here we talk about the extreme importance of tungsten carbide grain size.

Grain Size Is Key

The size of the tungsten carbide grains determines the mechanical properties of the final tungsten carbide cutting tools. The size of the grains will depend on the size of the tungsten oxide particles, and how long and at what temperature the oxide/carbon mixture is processed.

The tungsten carbide particles are a fraction of the size of a grain of sand. They are likely to range in size from half a micron, to as large as 10 microns. A series of sieves sorts out the different grain sizes: less than one micron, one and one half microns, and so forth.

At this point, the tungsten carbide is ready for blending into “grade powder.” In the tungsten carbide industry, one speaks of grades rather than alloys, but they mean the same thing.

The tungsten carbide goes into a mixing vessel with the other components of the grade. Powdered cobalt metal will act as the “glue” to hold the material together. Other materials, such as titanium carbide, tantalum carbide and niobium carbide are added to improve the properties of the material when cutting. Without these additives, when cutting ferrous materials, the tungsten carbide cutting tool may experience a chemical reaction between the tool and the chips of the work piece that leaves craters in the tool, especially at high cutting speeds.

 (To be continued-This article is divided into several parts and this is part 3, for part 2 please refer to )

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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

In last part we know that only decades before, scientists found and used the new material tungsten carbide, first as carboloy, then later added with titanium compound, to make tungsten carbide cutting tools. Here we explain the procedure to make tungsten carbide from tungsten ore.

Start In The Ground

There are several tungsten ores or minerals that can be mined and refined into tungsten or made into tungsten carbide. Wolframite is the best known. The ore is crushed, heated and treated with chemicals (acids or alkalis). The result is tungsten oxide after sodium tungstate. And tungsten oxide are to be treated with hydrogen to get pure tungsten metal powder.

Then, the fine tungsten oxide particles are carburized, turning them into tungsten carbide. In one method, the tungsten oxide is mixed with graphite (carbon). This mixture is heated to over 1200˚ C (2200˚ F) and a chemical reaction occurs that removes the oxygen from the oxide and combines the carbon with the tungsten to yield tungsten carbide.

(To be continued-This article is divided into several parts and this is part 2, for part 1 please refer to http://news.chinatungsten.com/en/tungsten-information/80244-ti-10321; for part 3 please refer to http://news.chinatungsten.com/en/tungsten-information/80247-ti-10323)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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, often called simply “carbide”, is a familiar material around the shop. This compound of tungsten and carbon has revolutionized the metal-cutting world over the decades, enabling increased speeds and feeds and providing longer tool life. Tungsten carbide was first investigated as a cutting tool material in 1925, by Dr. Samuel Hoyt, a scientist at General Electric’s Lamp Department. Later GE opened the carboloy division to produce tungsten carbide cutting tools. In the late 1930s, Philip M. McKenna, founder of Kennametal, discovered that adding a titanium compound to the mix made the tools work better at higher speeds. This began the march toward today’s lightning-fast cutting speeds.

“Cemented tungsten carbide,” the material that makes up the tools and inserts, is actually grains of tungsten carbide, along with particles of other materials, cemented together using the metal cobalt as a binder.

 (To be continued-This article is divided into several parts and this is part 1, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/80245-ti-10322)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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

In last part we know that tungsten carbide wood working drill bits, such as a brad-point bit, are characterized of a raised spur or sharp point at the end to precisely position and stabilized the bit. Here we introduce more types of wood working drill bits.

2. Auger Bit: An Auger bit has a screw tip that starts the hole and pulls the bit through the work piece to quickly create a clean hole. As with the brad-point bit, large flutes help remove chips and dust. An auger bit with a hollow center provides even more chip removal, allowing for deeper boring; one with a solid center is stronger and more rigid.

3. Self-Feed Bit: A self-feed bit bores through wood. Like the auger bit, a screw at the tip helps position the bit and draws it through the work piece. It doesn't have the standard flutes of a twist bit, so you need to pull the bit back periodically to clear away chips and dust.

(To be continued. This article is divided into several parts and this is part 2, for part 1 please refer to http://news.chinatungsten.com/en/tungsten-information/80238-ti-10315)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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 wood working drill bits are used for drilling into wood and some plastics. The bit is normally black in color and the tip of the bit has a raised spur or sharp point. This is used, before drilling, to place the point exactly where you want to drill the hole and using a bit of force to push the point into the wood to stabilize the bit before drilling. This will also ensure, while drilling, that your bit goes straight into the wood without running around and damaging the wood. You can use a variable speed drill for these bits but make sure the drill is not on the hammer position else you will damage the wood and the tip of the drill bit.

Here we introduce some commonly used types of wood working drill bits as follows:

1.Brad-Point Bit: A brad-point bit is designed for boring into wood. The brad at the center of the bit tip helps position the bit precisely for accurate drilling and produces a clean exit point in the work piece. The flutes — grooves that wrap around the bit and channel away chips and dust — are extra-wide to remove more material.

(To be continued. This article is divided into several parts and this is part 1, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/80239-ti-10316)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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

Hexagonal ammonium tungsten bronze, (NH4)0.33–xWO3–y, is a possible constituent of the intermediate “tungsten blue oxide” in non-sag (NS) tungsten production and a material of chromogenic and sensor interest. Its formation has been studied by in situ high-temperature powder X-ray diffraction (HT-XRD) accompanied by semiquantitative phase analysis through the partial thermal reduction of ammonium paratungstate tetrahydrate, (NH4)10[H2W12O42]·4H2O, in flowing 10 % H2/He. The effect of the heating program on the formation of the title compound has been discussed. Highly crystalline, monophasic hexagonal ammonium tungsten bronze prepared by partial reduction of ammonium paratungstate tetrahydrate has been characterised by high-precision powder XRD, X-ray photoelectron spectroscopy (XPS), chemical analysis and solid-state 1H NMR spectroscopy (1H-MAS-NMR).  

 

Tungsten Oxide, Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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 masonry drill bits are most commonly used in the home. The Masonry drill bit is generally silver in color and the tip looks spade like and the tip is normally painted red. They are used for drilling into brick, block, stone, quarry tiles or concrete. The cutting tip is made from tungsten carbide bonded to a spiraled steel shaft. These bits are used with a hammer action drill with or without speed variation, depending on what you are drilling into. Beware of cheap masonry bits as they will tend to break, shatter or even melt from too much force or heat that they generate. It is good to make sure that when you buy masonry bits that you talk to your hardware dealer and get the best option on masonry bits available.

Use a variable speed drill when drilling into harder surfaces. The harder the surface, the slower you set your drill speed. This will prevent the bit and the drill from being damaged and always make sure that when drilling with tungsten carbide masonry drill bits that you drill is set to the hammer action. This moves the bit back and forth while drilling in order to pound the surface to gain more depth without any damage.

You can use a masonry drill bit to drill into ceramic tiles. Should you do this, make sure that the hammer switch is in the off position and drill into the tile at a slower speed to prevent the tile from cracking.(The End )

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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

In last part we know that compared to steel tools, tungsten carbide tools, or various other even tougher cemented carbide tools, have absolute advantages in wear or heat resistance which increases work efficiency. Here we talk about the advantages of tungsten carbide tools verse diamond tools.

A number of mining products also contain an element of diamonds in them and given that diamonds are the toughest material that you can find, it makes the work pass an awful lot quicker. The only problem with using diamonds comes with the cost of these tools as diamonds represent a large outlay. It is still likely that the use of tungsten carbide tools provides far better value for money and it is not as if the finished results from using this style of tool is poor, it is not just as good as the best tool available!

If money and scarcity was no object, diamonds would be in use everywhere in the mining industry but it would be wrong to dismiss or overlook the importance of tungsten carbide tools. When used in a drill bit, the drill bit provides a much better return, with respect to time and durability than standard steel. The fact that anyone looking to cut through steel will regularly turn to a tungsten carbide tool indicates everything you need to know about the power and reliability of tungsten carbide.

The consistency of tungsten carbide in the relentless conditions down a mine makes it the natural choice for any work in this sector.

(The end-This article is divided into 3 parts and this is part 3, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/80170-ti-10296 )

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.
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