GB/T 39797-2021Test method for surface tension of glass melt—Sessile drop method (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the measurement principles, instruments and equipment, samples, tests, calculation and presentation of results, and tests for measuring the surface tension of glass melts. report.

This standard applies to the sessile drop method to measure the surface tension of glass melts.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1598 platinum rhodium 10-platinum thermocouple wire, platinum rhodium 13-platinum thermocouple wire, platinum rhodium 30-platinum rhodium 6 thermocouple wire

GB/T 11446.1 electronic grade water

GB/T 21389 Vernier, belt meter and digital caliper

GB/T 26497 electronic balance

GB/T 30071 Fine-grained high-density special graphite products

GB/T 32201 gas flow meter

YY/T 0686 Medical tweezers

3 Terms and definitions

The following terms and definitions apply to this document.

4 Measuring principle

The surface tension of the glass melt is measured based on the sessile drop method. The glass melt is rotated by the combined action of gravity and surface tension on the horizontal pallet.

Axisymmetric ellipsoid (see Figure 1), the relationship between the pressure difference at any point on the surface of the ellipsoid and the surface tension is shown in equation (1).