Dense Tungsten Alloys Melting Other Production Methods

Producing dense tungsten, and alloys in addition to powder metallurgy methods, there are melting, chemical vapor deposition, physical vapor deposition method.

Consumable Electrode Vacuum Arc Melting

Modern electric arc smelting, melting usually consumable tungsten electrode and the copper and copper alloy arc melting crucible. In a vacuum state, the molten metal is cooled copper crucible inflows (ingot mold) cooled into ingots, the thermal conductivity of copper, the heat transfer is easy, so that the liquid metal contacts to the water-cooled copper crucible rapidly solidified, thus eliminating the tungsten, and copper alloy and the reaction between the crucible. Tungsten metal is melted in the arc flame, electric arc occurs in the upper electrode (consumable) and the lower electrode (copper ingot mold tungsten and its alloys) between. Consumable electrode vacuum arc melting the cathode, the molten metal as the anode.

Tungsten arc melting ingots having a coarse grain structure, therefore, brittle, can be eliminated after the melting heat stress treatment, or adding other elements as an impurity scavenger, and a gap to control the grain size.

Electron Beam Melting

Electron beam melting high purity tungsten and alloys thereof, but not particularly coarse grain, not the pressure processing. Industrially used by the primary electron beam melting and then vacuum consumable arc melting. Electron beam melting tungsten alloy products and the intensity ratio of output arc melting and powder metallurgy products low and plastic - brittle transition temperature close to or slightly above them.

Zone Melting

Electron beam heating method using tungsten, and alloys of zone melting, can be obtained by zone melting high purity tungsten, having a Vickers hardness of 2842-33430, tungsten has also been greatly improved toughness.

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