the Invention of Lanthanum Tungsten Electrode Manufacturing Method

Lanthanum tungsten electrode manufacturing method, comprising lanthanum tungsten-coated powder preparation , reduction, pressure type , melt down , and finished processing the preform , characterized in that : a. Using lanthanum acetate and including APT, tungsten and tungsten trioxide powder the solid material into a slurry with water mixed to prepare a lanthanum tungsten-coated powder ; b. lanthanum tungsten-coated powder decomposition of lanthanum was conducted in a hydrogen atmosphere , a reduction temperature is controlled at 600 ~ 700 ℃, time 2-3 hours , the second reduction temperature controlled at 800-970 ℃, reduction time 3-5 hours , the hydrogen flow control during the 0.5-2.0m3 / h.

The process of the invention include use of lanthanum acetate was added to APT, tungsten and tungsten trioxide powder of solid material , synthetic lanthanum tungsten-coated powder prepared by the method of lanthanum tungsten electrodes , instead of lanthanum nitrate used in the prior art tungsten-coated powder preparation Lanthanum the method of eliminating nitrogen oxides due to the gas generated by the decomposition of nitrate pollution. Since lanthanum acetate and lanthanum nitrate in the decomposition temperature differences, resulting in process effect differences. Prepared using lanthanum acetate, lanthanum tungsten-coated powder decomposition temperature greatly reduced , effectively simplify the process , and the method of the present invention is carried out in a hydrogen atmosphere using lanthanum decomposition avoids lanthanum compound is unstable in an oxidizing atmosphere of volatile , but also make the lanthanum salts decompose more fully, significantly improved vertical melt process the Chinese material conductive properties. With the lanthanum salt decomposition and reduction process to achieve continuous operation in the same device to complete two processes , greatly simplified the process, the reduction of working hours , saving energy , is an ideal method for producing lanthanum tungsten electrodes .


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


 

• < Prev
• Next >