GB/T 14634.6-2010Test methods of rare earth three-band phosphors for fluorescent lamps - Part 6: Determination of specific surface area (English PDF)

Foreword

GB/T 14634 "light rare earth trichromatic phosphors Test Method" is divided into seven sections.

--- Part 1. Determination of relative brightness;

--- Part 2. Determination of emission peak and color performance;

--- Part 3. Determination of thermal stability;

--- Part 4. Electric sensing particle size distribution measurement;

--- Part 5. Determination of density;

--- Part 6. Determination of specific surface area;

--- Part 7. Determination of thermal quenching.

Part is divided into 6 sections.

The partial revision of GB/T 14634.6-2002 "light rare earth trichromatic phosphors Test Method for Determination of specific surface area," the.

This section compared with the GB/T 14634.6-2002, the main changes are as follows.

--- Adjust some analysis condition;

--- Increasing the precision of the terms, adjusted the allowable difference;

--- Standard text made editorial changes.

Appendix A of this section is an informative annex.

This part of the National Standardization Technical Committee rare and centralized.

1 Scope

GB/T 14634 provisions of this part of the measurement method using light rare earth trichromatic phosphor surface area.

This section applies to light rare earth trichromatic phosphor surface area measurement.

2 Principle of the method

At a certain temperature, the laminar flow of air through the time required for a certain thickness of the powder bed and the surface area ratio of the powder into a certain functional relationships system. The amount of air flowing into a certain thickness of the powder bed is changing the flow rate for the time integral of the results. The air through the powder bed Time to the specific surface area of powder.

3 Instruments and apparatus

3.1 surface area analyzer (see Figure 1).

3.2 Balance. Precision 0.001g.