99.95 polishing Tungsten Price Kg Tungsten Round Bars Price
Description
Tungsten bar with impurities is used to procedure bulb filaments or electron tube filaments, which are guaranteed to have remarkable resistance to high temperature.
Its porous form has been a crucial component of dispenser cathodes used in electronic valves and high power lamps. Porous tungsten skeleton forms the matrix. which is then impregnated with an electron emissive compound. Upon every emission front the surface, new material has to be fed into the surface pores via the open pore channels. Hence it may be proposed that a uniform porosity is needed for a better performance. However, a controlled porosity has not been achieved yet.
Moreover, sintering of tungsten has always been difficult due to the extreme process conditions. A high sintering temperature (T-s >= 2000 degrees C) and a strong reductive atmosphere (hydrogen) have been the absolute necessity in making these parts. This study further explores an alternative sintering technique being developed. The idea is based on the reactive sintering concept. The energy output from the exothermic reactive system of tungsten oxide and aluminium has been the heat source for sintering porous tungsten. As a result, sintering temperature and time have been reduced considerably. Higher homogeneity, thus more uniform pore distribution, was observed.
A better control of porosity related to the pressing and sintering conditions was achieved by the characterisation method previously developed. Microhardness has been a useful monitor of the scatter in porosity of the parts. Throughout the study, SEM was used to observe the porous Structures and powder morphologies. DSC and XRD were useful to follow the microstructural evolution in the reactive system.
products | 99.95 polishing Tungsten Price Kg Tungsten Round Bars Price | |||
Purity | ≥99.95% | |||
Technology | Powder Sintering | |||
Material | W1,W2 | |||
Surface Treatment | Grinding | |||
Dimension (mm) | OD 3.0 ~ 12 mm Lenght 800 mm-1000mm | |||
Total Porosity | 40% Max. | |||
Application | electrodes in the field of rare earth metal industry | |||
Tungsten | Fe | Ca | P | Sn | Al | Ni | N | Sb |
W1 | 0.001 | 0.001 | 0.001 | 0.0001 | 0.0001 | 0.00035 | 0.002 | 0.0001 |
Balance | Bi | Mo | Mg | C | Si | O | Pb | As |
99.95% | 0.0001 | 0.0008 | 0.0001 | 0.00085 | 0.001 | 0.0047 | 0.0001 | 0.0001 |
Finished Form | Specified Diameter (mm) | Min.Length (mm) | Diameter Tplerance |
Wroughted | 2.8≤d<5.0 | 600 | +/-2% |
5.0≤d<6.5 | 300 | ||
6.5≤d<11.0 | 200 | ||
Straightened | 0.8≤d<1.0 | 1000 | +/-2% |
1.0≤d<3.0 | 800 | ||
Ground | 0.8≤d<3.0 | 800~1000 | +/-0.03 mm |
3.0≤d<6.5 | 300~600 | +/-0.03 mm | |
6.5≤d<10.0 | 200 | +/-0.03 mm |
Suitable for producing ion implantation parts;
For producing electric light source parts and electric vacuum components;
For producing heating elements and refractory parts in high temperature furnaces;
Used as electrodes in the field of rare earth metal industry.
Advantages:
1.High density.
2.Good mach-inability.
3.Good mechanical properties.
4.High Modulus of elasticity.
5.High absorption capacity against x-rays and y-rays.
6.Harmless and environment friendly.
factory
workshop
smelting furnace
Packing Details : soft paper inside with wooden case outside
Delivery Details : 10-15 working days
Our R&D center
We have five engineers,engaged in researching the usage of nitinol shape memory alloy products ,especially in medical and aerospace areas.
Senior Engineer
Mr. Deng
The exclusive supplier contract
Joe is from US.He is the scientist of nitinol.He signed the exclusive supplier contract with us after his visiting !
Now,he is one of our big customers !
He sells our products to US market!
Customers from HK &Korea
We become their long-term relationship supplier for nitinol flat wire and springs!
Thanks a lot the support and trust from all our customers!
We will keep improve to make you satisfied forever!
Our customers spread over North America, South America, Europe, Southeast Asia etc.
MEDTRONIC VISITED OUR FACTORY
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact us as below:
Additional information
| Place of Origin: | Shaanxi, China |
|---|---|
| Brand Name: | seabird |
| Model Number: | seabird-007 |
| size: | dia1mm-12mm |
| Color: | ground surface and polishing |
| certificate: | ISO9001:2015 Rosh |
| Technique: | Sintering |
| Operating Temperature: | ≤ 2500 Deg. Celsius |
| purity: | W1 – 99.95% |
| Application: | Thermionic Emission Cathodes |
| Porosity: | 30% |
| Density: | 18.0-18.2 G/cm3 |
| products: | 99.95 polishing Tungsten Price Kg Tungsten Round Bars Price |