By comparing the magnetron sputtering method and sol-gel method producing tungsten trioxide films respectively found little difference in light transmittance. But the films producing by magnetron sputtering method the spectrum peaks and valleys more obvious that is the film producing by magnetron sputtering absorb different wavelengths light greater than the sol- gel method.

Analysis films transmission spectra which are producing by gel-sol method at different annealing temperatures before and after. Tungsten trioxide film producing by sol-gel method, the annealing temperature is higher, the lower the light transmittance of it. At 300℃ annealing for 30min, film transmittance fell by an average of 10%, peaks and valleys wavelength position will move to ultraviolet wave slightly which is not obvious. At 380℃ annealing transmittance of the film was reduced by 20% to 25%, and in the infrared portion the light transmittance decline rapidly, the peak number did not change, the difference between the peaks and troughs of the light transmittance becomes smaller. After annealing at 400 ℃ film transmittance decreased by 25% to 30%, and in the infrared portion the light transmittance decline was particularly pronounced.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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


 

Tungsten carbide ball burs can create concave cuts at any angle in work pieces and get into the material at any angle or tight areas, and it is also a proper choice for shaping or hollowing out an area. The commonly sizes refer to the ball burs are varied, the smallest one could be as tiny as 0.5mm, which are ideal for intricate carving projects.

By adopting tungsten carbide ball burs, operator could easily make recesses for sweat-soldering, engrave, texture, debur, drill and enlarge holes, cut rounded notches for stone-setting and refine bezels and prongs. Since tungsten carbide ball burs offer so many purposes, they are widely used in wood carving, stone carving and metal engraving, which are also very well accepted among the jewelers.   
 

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

Using WGZ-8 double-beam UV - visible spectrophotometer to analysis transmittance of film, the incident light wavelength range of 200 ~ 800nm, light transmission rate of 0% to 150%. Using sol-gel method produce tungsten trioxide films and the transmission spectra showed maximum light transmittance and wavelength corresponding respectively: 85.3%, 556nm, peaks and troughs in the 350 ~ 600nm wavelength range, light transmittance difference at the peaks and valleys value of 4.4%, the wavelength range which is less than 300nm the light transmittance almost all zeros.

And use magnetron sputtering method produce tungsten trioxide films found maximum light transmittance and the corresponding wavelength ranges were: 90.1%, 572 ~ 582nm which peaks and valleys within the 350 to 650nm wavelength and the difference between the peaks and troughs in the light transmittance is about 21.2%. Comparison two lines of transmittance spectra will know the light transmittance difference is not big which produced by sol-gel method and magnetron sputtering method.

When films produce by magnetron sputtering at 450 ℃ the transmittance of the films dropped by an average of about 8% to 10%, peak shape and position almost unchanged. When the annealing temperature at 500 ℃, the light transmittance films dropped by an average of about 8%, the peak position and peak shape has not changed much.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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


 

Tungsten carbide burs are used to deal with cutting, shaping, grinding and removing the sharp edges, burs and excess material in practices and end mills for metalworking as well as for holes of all sorts. During the operation, for the safety consideration, here are some usage recommendation to review.



1.Make sure the bur shank is always well inserted int o the collet, and it is clamped down tightly enough.

2.Ensure the pressure is light and always ensure the bur moving focusing on the highest material first.

3.Make sure the work piece and the work bench is well secured.

4.Ensure the burs don't snag or jam into the work.

5.Always wear eye protection as a bottom line, whereas a full shield for face is recommended.


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