Tungsten & Sapphire Growth Furnace Price

High Purity Tungsten Rod Introduction

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 15:17; Written by jwy; Hits: 588

High purity tungsten rod can be used as heat conductor, additive, crankshaft and cylinder barrel of automobile, parts of heat-resistant steel and electrode. High purity tungsten rods are mainly used in guns, rockets, satellites, airplanes and ships.

Chemical components for different purity Tungsten Rods:

W (>%)	Chemical Content (<%)
99.999	Fe	Ca	Be	Sn	Al	Ni	Zn	Sb	Pt	K	Ta	Na
	0.1	0.05	0.005	0.005	0.05	0.01	0.05	0.05	0.03	0.005	0.1	0.05
	Cr	Pb	As	Mg	Ti	Bi	Mo	Cd	Cu	Ba	Co	Mn
	0.005	0.01	0.05	0.05	0.005	0.01	0.01	0.005	0.007	0.01	0.005	0.005
99.99	Fe	Ca	Be	Sn	Al	Ni	Zn	Sb	Pt	K	O	Na
	0.1	0.45	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.5	4	0.9
	Cr	Pb	As	Mg	Ti	Bi	Mo	Cd	Cu	Ba	Co	Mn
	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.1	0.1	0.1	0.1	0.1
99.95	Fe	Ca	P	Sn	Al	Ni	N	Sb	Si	O	Pb	As
	5	3	1	0.1	2	3	3	1	3	3	0.1	2
	Mg	C	Bi	Mo
	2	5	0.1	1

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Grain Growth in Tungsten Rod

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 15:03; Written by jwy; Hits: 621

Samples were deformed at elevated temperatures in compression and then annealed. The microstructure was examined by optical metallography, scanning electron microscopy, and electron backscattering diffraction patterns (EBSP) in the scanning electron microscope. The results showed that when the samples were deformed at a high crosshead speed at 1200, 1400, and 1600°C, the microstructure consisted of grains that had developed a high aspect ratio in the regions of the sample that had received the most deformation. When these samples were annealed, a more equiaxed structure was produced. Samples deformed at 1800°C developed very fine recrystallized grains during the mechanical testing. These remained during the anneal. When the crosshead speed was reduced, these fine grains could be observed even after testing at 1200°C. EBSP revealed little, if any, crystallographic texture in the recrystallized grain structure. These results are compared with previous work on tungsten rod to develop a more complete description of this process.

For many years there has been a great interest in understanding grain growth in aliminum-potassium-silicon (AKS) doped tungsten because of its importance in the lighting industry. The non-sag struture of long-life lamp filament is produced by s process secondary recrystallization (abnormal grain growth) in which the final grain shape is controlled by the rows of potassium bubbles present in the material. Also, during the processing of tungsten to make wire, it is often necessory to anneal. Grain growth in these rods occurs by a process in which a few grains grow and consume all others. The mechanism could be described as secondary recrystallization, but it has been suggested that the process is better described as strain annealing, since the few grains that grow nucleate in a matrix that is polygonized and thus is similar to the lightly deformed matrix in which the large grains grow during strain annealing.

One question that has not been addressed in whether or not there is a crystallographic component to this process. That is, do the few grains that grow in the rod and consume the others have a particular orientation relative to the sample orientation or the way that it was deformed. In this paper, we investigate this process through the use of backscattered Kikuchi patterns formed in the scanning electron microscope. Our results will show that there may be a slight crystallographic preference in the grains which initially begin to grow, but that when grain growth is complete the orientation of the grains is random. We also show that strain rate slow enough, small grains can form by dynamic recrystallization during deformation. Finally, we suggest that the formation of the new grains is controlled by the number of nucleation sites in the material and in some cases the resulting grain size may be smaller than the original grain size ans in other cases larger, Thus, trying to classify the process as recrystallization, grain growth, abnormal grain growth, or strain annealing may not be important; rather having a good understanding of the factors that control grain growth is what will allow engineers to develop material with the desired properties.

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How to Place Fishing Sinkers to the Line 2

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 09:05; Written by Sherry; Hits: 572

Then wrap the line around the fishing sinker and tie a knot. Make the knot stable, so the fishing sinker does not slide up and down the line. Also, estimate where your hook will be and how much slack you need to retie it to the line. Your fishing sinkers should be close to the hook but does not need to be directly above it.

Then, create individual knots if you determined that you need to use more than one fishing sinker on your fishing line because you want to lower your bait. While it may be easier to simply slide a few sinkers on the line and tie a knot, it may break the line. Repeat the above steps for each individual fishing sinker you use.

Finally, replace the hook that you have removed from the line once you have placed the fishing sinkers securely on your fishing line.

tungsten-fishing-sinkers

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Microstructure of Rolled and Annealed Tungsten Rod

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 14:53; Written by jwy; Hits: 588

The effect of annealing on the microstructure of the rolled material is also considered. All samples were rolled on a Kocks mill. At low levels of deformation, the grain boundaries are primarily high-angle boundaries, and many grains are dislocation free. Both of these features probably result from dynamic recrystallization during rolling.

As deformation increases, the grains become more elongated, and more low-angle boundaries are found within the material. Also, the potassium gets drawn into narrower and longer tubes. When these rolled rods are annealed at temperatures between 1275 ‡C and 1950 ‡C, several changes occur in the microstructure. The material undergoes abnormal grain growth. The temperature at which this occurs depends on the length of the anneal, the amount of de-formation the rod has received, and the spatial location in the tungsten rod.

This spatial distribution most likely results from strain gradients that exist in the rolled tungsten rod. The abnormal grain growth is accompanied by a decrease in hardness. The potassium-containing tubes in the rod also break up into bubbles during annealing. The temperature at which this breakup occurs again depends on the length of the anneal and the amount of deformation.

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Tungsten Carbide Rod Applications

Details: Category: Tungsten Information; Published on Monday, 22 September 2014 17:32; Written by jwy; Hits: 610

The applications of this product is also found in electronic industry as it is Sintered in HIP Furnace and is made of 100% virgin raw material. They are used in making drill bits/end-mills/reamers, as automobile special cutters, printed circuit board special cutters, integral vertical milling cutter, graver etc. In addition, they are used for making of cemented carbide stamping head, core bar and perforation tools. Tungsten carbide bar is the other product of cemented carbide that is mainly used for high standard bearing steels, automobiles, in high-speed railways, for high precision equipment and in high tech weapons.

Tungsten carbide rod with grade of YF06 is suitable for machining composite materials such as aluminum magnesium alloys, carbon fiber, reinforced plastics and iron based alloys etc.. This product id recommended for making big PCB drills of Φ3.2-6.3 mm, micro drills of Φ0.8-3.2 mm micro milling tools and reamers etc.. These tungsten carbide rods come in various sizes and shapes such as tungsten carbide ungrounded rods,precision ground tungsten rods, precision groung tungsten carbide rods, sintered rods with one straight hole.

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