Tungsten & Sapphire Growth Furnace Price

Cemented Carbide Cutting Tool Chipping Resistance

Details: Category: Tungsten Information; Published on Monday, 04 May 2015 11:34; Written by lucy; Hits: 428

A cemented carbide cutting tool made of a tungsten carbide-based alloy having high chipping resistance comprising:

8 to 13 percent by weight of Co and 0.1 to 3 percent by weight of Cr as constituents for forming a binding phase, the balance being tungstencarbide as a constituent for forming a dispersing phase and incidental impurities, the rate of the dispersing phase to the total of the dispersing phase and the binding phase being in a range of 72 to 90 percent by area and the average particle diameter being 1 μm or less according to measurement of an electron microscopic texture; wherein the dispersing phase of the cemented carbide cutting tool made of a tungsten carbide-based alloy comprises a dispersing phase composed of ultra-fine particles dispersed in a matrix and having a particle diameter of 100 nm or less, and the ultra-fine particles comprise a Co based alloy.

The Co content is limited to 8 to 13 percent by weight in the cemented carbide alloy constituting the cemented carbide cutting tool of the present invention, because sufficient toughness is not achieved at a content of less than 8 percent by weight whereas abrasion resistance steeply decreases at a content of higher than 13 percent by weight.

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Cemented Carbide Cutting Tool Comprising

Details: Category: Tungsten Information; Published on Monday, 04 May 2015 11:32; Written by lucy; Hits: 417

A cemented carbide cutting tool made of a tungsten carbide-based alloy comprising:

A dispersing phase comprising tungsten carbide having an average particle diameter of 1 μm or less,a binding phase comprising Co and Cr,and ultra-fine particles comprising a Co alloy having a particle diameter of 100 nm or less,wherein the dispersing phase is 72 to 90 percent by area of a cross section of the cemented carbide cutting tool; the ultra-fine particles are dispersed inside the tungsten carbide; and the cemented carbide cutting tool contains 8 to 13 percent by weight of Co, 0.1 to 3 percent by weight of Cr, the balance being tungsten carbide and incidental impurities.

And more specifically, relates to a cemented carbide cutting tool having a sharp cutting edge and maintaining high cutting characteristics for long service life when used as an end mill having an intermittent cutting mode and when cutting is performed under heavy cutting conditions such as at high feed rate and high cutting depth.

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The Advantages of Argon Arc Welding

Details: Category: Tungsten Information; Published on Thursday, 30 April 2015 17:47; Written by xiaoshan; Hits: 487

Argon arc welding has been high-speed growing and is widely used at home and abroad alike. In recent years, this kind of welding technique, especially manually welding, is considered to be an indispensable welding method in various metal structures and is in pressing need among many areas and fields. For years, the technique has been highly mechanized and automatized and will inevitably undertake the journey of digital control with higher accomplishments.

Argon shield prevents some gases in the air, eg. oxygen, nitrogen and hydrogen, from eroding the electric arc and furnace hearth, and reduces the waste rate of alloying elements while burning. Under such condition the welded joints will be more firm and intense without splashing.

Argon arc welding ensures stable burning with concentrated heat. As a result, it greatly increases the welding efficiency with high arc column temperature and narrow heat-affected zone. And the welded pieces will not crack out of shape easily.

Argon arc welding is operated through open arc which is easy to observe

The loss of electrode is small; the length of arc is easily maintained; with flux and primering free in the process, it is easy to be mechanized and automatized.

It can weld almost all metals through argon arc welding, especially refractory metal and the metal that is easily oxidized, such as magnesium, titanium, molybdenum, zirconium, aluminum and its alloys.

Not limited by the pieces, it can be welded within all positions.

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Coated Cemented Carbides Wear Resistance Tool

Details: Category: Tungsten Information; Published on Monday, 04 May 2015 11:27; Written by lucy; Hits: 491

A coated cemented carbide alloy, excellent in toughness as well as wear resistance and which is used for cutting tools and wear resistance tools is provided herein,

A coated cemented carbide alloy, excellent in toughness as well as wear resistance and which is used for cutting tools and wear resistance tools is provided herein. This coated cemented carbide alloy is composed of a cemented carbide substrate consisting of a hard phase of at least one member selected from carbides, nitrides and carbonitrides of Group IVb, Vb and VIb metals of the Periodic Table and a binder phase consisting of at least one member selected from the iron group metals, and a monolayer or multilayer, provided on the substrate consisting of at least one member selected from carbides, nitrides, oxides and borides of Group IVb, Vb and VIb metals of Periodic Table, solid solutions thereof and aluminum oxide, and wherein a binder phase-enriched layer is provided in a space 0.01 mm and 2 mm below the surface of the substrate with A-type and/or B-type pores inside the binder phase-enriched layer.

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Which Kind of Tungsten is Difficult to Make?

Details: Category: Tungsten Information; Published on Thursday, 30 April 2015 15:53; Written by xiaoshan; Hits: 468

With high melting point, high density as well as good conductivity at high temperature, tungsten plays an important and indispensable role in defense industry and domestic economy, especially in top fields like aerospace and nuclear industry.

The production of tungsten components with thin wall and complex shape is an internationally recognized problem.

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