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)

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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)

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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).  

 

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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 )

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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 )

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1. Size: Use vernier calipers to measure, accurate to 0.01mm.

2. Density: Drain method, calculated by formula d=m₁ρ/m₁-m₂ (d-sample density, ρ-water density in the air, m₁-sample weight in the air, m₂-sample weight in the water).

3. Granularity: Measured by Fisher Particle Size Analyzer, the principle is that Steady flow permeability, which measure specific area and average granularity of powder under stable velocity and pressure of flow.

4. Hardness: It is different from Rockwell hardness tester of tungsten carbide, tungsten copper uses Brinell hardness tester for hardness testing.

5. Electric Conductivity: R=U/I，ρ=RA/L，G=1/ρ (R- Resistance, U- Voltage, I- Electric current, ρ- Resistivity, A- Cross-sectional area, L- Length, G-Electric Conductivity)

6. SEM: Observe appearance and structure of powder by SEM (Scanning Electron Microscope)

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Tungsten copper electrode has been concerned in worldwide field of science as widely used electrode by PM (Powder Metallurgy). Under conventional sintering conditions, tungsten and copper densification process is affected by insolubilization and low wettability of two metals, which structure, distribution, density and size can not reach ideal state. Although some new processes or technologies are emerging, such as rapid directional solidification, ultra-fine powder, FGA (functional gradient material) and so on, there still some problems remains as follow:

1. Relative research is not deep enough, the required equipments are expensive, the complicated process, difficult for machining.

2. The conditions and equipments are restricted.

3. The elements additives have an effect on thermal and electric conductivity of tungsten copper electrode.

4. Most researches focused on the preparation of high-performance composite material and the forming mechanism of tungsten copper has been neglected.

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The bulk structural evolution during the decomposition of ammonium paratungstate (APT) under various oxidizing and reducing gases was elucidated by the complementary techniques, in situ XAS, in situ XRD, and TG/DSC, combined with mass spectrometry. In the temperature range from 300 to 650 K, the decomposition of APT proceeds nearly independently of the gas employed. At higher temperatures, an oxidizing gas results in the formation of crystalline triclinic WO3 as the majority phase at 773 K, while mildly reducing gases (propene, propene and oxygen, and helium) result in the formation of partially reduced and highly disordered tungsten bronzes. No further reduction is observed under propene or helium, and this indicates a strongly hindered oxygen mobility in the tungsten oxide lattice in the temperature range employed. The decomposition of APT under hydrogen results in the formation of WO2 and, eventually, tungsten metal. During the thermal treatment of APT, major changes occur at ca. 500 K where a complete structural rearrangement takes place that results in the destruction of the polyoxotungstate ion of APT and the formation of a tungsten oxide bronze. The rather low temperature for the formation of a three-dimensional lattice compared to the thermal treatment of common polyoxomolybdate precursors indicates the lower stability of the precursor and intermediates as ligands are removed. For tungsten to act as a potential structural or electronic promoter in molybdenum oxide based catalysts, tungsten needs to be incorporated in regular molybdenum oxide structures already at a very early stage of the catalyst preparation. 



 

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Mining industry is one where there can be a relentless need for power and strength and any operator or business wants to ensure that they can get great results every single time. With tungsten carbide being one of the toughest materials known to man, it is no surprise that the mining industry relies on tungsten carbide tools.

There are many activities in the mining industry which consist of nothing more than cutting through miles and miles of very tough rock. You could imagine the frustration of workers or the slowness of a project if drill bits and tools kept on breaking or had to be replaced every couple of minutes. This is why there is a massive need for tools that are not going to wear down, because in modern business, time is money and replacement products cost money too. All in all, any time that is not spent cutting through rocks or operating machinery is costing money and in the current economy, this is not tolerated by any business. This is why tungsten carbide tool, something that is less likely to wear out, is the number one choice for cutting, drilling or contact tip when working in a mine.

(To be continued. This article is divided into 3 parts and this is part 1, for part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/80170-ti-10296)

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