Title: Chemical aspects of the production of television‐tube screens. I. Reaction of potassium silicate in solution. Effect of impurities
Abstract: Abstract In the manufacture of television‐tube screens, the phosphor powder is attached to the inside of the glass front of the tube by means of soluble silicate adhesive. The usual process uses potassium silicate and an ‘additive’ salt such as barium nitrate to set the binder between particles. The basic barium ion‐colloidal silicate reaction has been investigated using a simple flocculation test to assess reaction rate. For any specified potassium silicate solution, this rate was proportional to [barium] 2 /[silicate]. Larger colloidal silicate units, i.e., more concentrated solutions, reacted more quickly. Iron and aluminium impurities in the silicate provided nuclei speeding up the reaction, which were sensitive to pH change by dilution, becoming more effective at lower concentrations and with time after dilution. Their effect was proportional to their concentration in the silicate. A flocculation test for silicate purity is suggested.
Publication Year: 1964
Publication Date: 1964-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 6
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