DEEP HOLE DRILLING INSERTS,LATHE MACHINE CUTTING TOOLS,CARBIDE INSERTS

Tungsten (W) is the main raw materials of tungsten points, that is to say, analysis of tungsten points’ surface film from its electrode potential is similar to the analysis of tungsten.
Each species owns the characteristic of standard electrode potential, which is a kind of equilibrium electrode potential.

The standard electrode potential at 25 ℃

Metal	Ion	Electrode potential (V)
W	W	-0.2
tungsten carbide inserts Ni	Ni2+	-0.23
Ag	Ag+	+0.799
Cu	Cu2+	+0.34
Pb	Pb2+	-0.126
Fe	Fe2+	-0.44

Standard electrode potential---put a matter in some kind of solution, which contains matter’s ions, the potential difference between the matter and the standard hydrogen electrode is the very standard electrode potential when ion concentration is 1g / L. The metal will be more active when negative value of standard electrode potential is bigger; but it will be less active when standard electrode positive value is larger.

What can be drawn from the table is that the potential difference between W and Cu is the biggest, which is 0.54V. The points’ material electrochemical corrosion is prone to appear in a high temperature, high humidity environment. Nevertheless the corrosion between W - Ni is slighter than W - Cu’s, W – Ag’s. Electrochemical corrosion is not prone to occur since the potential difference of W - Ni is only 0.03V, whose. Therefore, adding a right amount of Ni can improve oxidation resistance property of tungsten points, which will reduce the formation of its surface film.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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The four steps are applies an axial pressure to the powder, produces plasma for activation of the powder particles through pulse current discharge, with a direct current resistance of the sample is heated up to the required temperature and maintained for a certain time and the stress relief step. The most obvious difference between SPS and PAS is the third step, which SPS is heating by pulse current and it does not use DC as hot source during the whole sintering process.

Compared to common hot pressed sintering, conventional sintering and hot isostatic pressing (HIP), tungsten carbide nozzle plasma activated sintering technology has many advantages. First of all, it uses a DC to heat powder material and a graphite mold directly, and uses switching DC pulse voltage to generate high-temperature plasma among the powder particles or between voids. Therefore, the operation will be more convenient and more precise in carbide cutting inserts sintering energy controlling. And the inside of material has been heated uniformly, the heat transfer efficiency improved, the material densification improved.
















Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:  sales@chinatungsten.com
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

First of all, we should be in the form of law to explicitly prohibit the uses of dirty bombs, any countries, any persons can’t use any reasons to use the dirty bombs. Secondly, the states must strengthen the supervision of the use of radioactive substances. In addition, we can use the tungsten alloy shielding containers to store the radioactive dirty bombs, which have been manufactured, or already exists. The reason for using tungsten alloy shielding containers to shield the dirty bombs is that the tungsten alloy has great highly density and good corrosion resistance, which can not only have the good radiation shielding capacity for the dirty bombs, but also have the long storage capacity, in order to avoid the problems of the dirty bombs leaking that caused by corrosion of the containers. Finally, if one area is attacked by the dirty bombs, the government should immediately Deep Hole Drilling Inserts command people to evacuate from the area, in order to ensure the safety first of all, then enclosing the area and taking the scientific management to treat the radiation problems.