Production process of quarternary carbonate powder

Abstract

The production process of quaternary carbonate powder includes the following steps: firstly, making scandium oxide and hydrochloric acid produce reaction to produce scandium chloride, then making thescandium chloride, barium nitrate, strontium nitrate, calcium nitrate and sodium carbonate produce coprecipitation reaction to obtain quaternary carbonate, then making the obtained quaternary carbonate undergo the processes of centrifugal filtering, washing, drying and sieving to obtain the invented finished product. Said product can be coated on the cathode, its transmitted current density can be raised by aboev once as compared with cathode coated with ternary carbonate.

Description

technical field [0001] The invention relates to a manufacturing process of quaternary carbonate powder composed of barium carbonate, strontium carbonate, calcium carbonate and scandium carbonate. The quaternary carbonate powder is mainly used as large-screen color picture tube and color display tube (hereinafter referred to as color tube) and can also be used to replace other cathode emitting materials for cathode ray tubes (CRT). Background technique [0002] The cathode is the heart part of the color tube. Its function is to emit electrons. These electrons are focused and accelerated by the electron gun and hit the fluorescent screen to stimulate the phosphor to emit light and form images that people can see. Usually, the cathode structure used in color tubes is shown in the accompanying drawings, and they are mainly composed of cathode sleeve (1), cathode cap or base metal (2), rare earth metal carbonate coating (3) and heating wire (4). The cathode casing (1) is provide...

AI Technical Summary

Problems solved by technology

However, the scandium oxide added in the above process is physically mixed with the ternary carbonate powder, and the scandium oxide is not uniformly dispersed, resulting in inconsistent cathode emission current density

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