Experimental method for thermal discoloration of quartz glass tubes GB 4,121,183 This specification is applied to test the thermal discoloration of transparent quartz glass tubes and other products.
1, the experimental principle of transparent quartz glass after heat resolved, light transmittance change. The value of $number N M wave is used as the measure of the change of color performance. 2 Sample Preparation 2.1 quantity: three. 2.2 Shape and size should be in accordance with the rules of the following table: mm Tube or product shape and size of the diameter of less than 40 pipe length $number, according to the axial cut into two diameter greater than 40 pipe length $number, cut into the string width of 20 model products 30X15XS (plate thickness) design 2.3 The appearance of the specimen should fit the corresponding JC 177-81 "DTSi transparent quartz glass tube" or J C 224-81 "DTS2 transparent quartz glass tube" rules. 3 experimental equipment and data 3.1 low-temperature furnace one, task temperature 1000±20℃. 3.2 Electric Oven one. 3.3 Ultraviolet Spectrophotometer One, the measurement accuracy of transmittance is ±1%. 3.4 With lid of the gas-smelting quartz glass Sample box, the size of the specification is φ100mm x 80mm. 3.5 chrome-plated crucible pliers and a bamboo clip each. 3.6 125mm vernier caliper with a precision of 0.02mm. 3.7 Chemical Pure anhydrous ethanol. 3.8 skim gauze or absorbent cotton. 3.9 Glass Beaker. 4 Preparation of 4.1 specimens: 4.1.1 The specimen in a beaker with anhydrous ethanol soaked in 15-20min, removed and wiped with skim gauze. 4.1.2 will use the sample box and lid of the experiment to solve the problem in the same way. 4.1.8 with a clip to put the specimen in the sample box, the sample box and the lid placed in the oven, drying (drying the lid is not covered) to be used. 4.2 Temperature rises to 1000±20℃. 4.3 Dispensing ultraviolet spectrophotometer. 5 Experiment Step 5.1 The wavelength of the spectrophotometer is transferred to $number nm, and the 100% transmittance is calibrated. 5.2 The sample holder, which will be solved, is recorded from the 2.0014 million nm transmittance curve. 5.8 will have measured the transmittance of the sample, put the person in the sample box, cover the lid, put the person in 4.2 good low-temperature furnace, insulation 2h. 5.4 The Sample box containing the sample is removed from the furnace and cooled in the air, and the transmittance of the sample is determined by 5.2. 6 Consequences calculated 6.1 Quartz glass Thermal solution discoloration performance, to the unit thickness of the sample, at the wavelength of $number nm at the transmittance change value t,%/mm schematic, and press the calculation: = (t1-t2) d-Type: t1--sample heat before the solution at $number nm transmittance,%, t2-- The transmittance of the specimen after heat resolved at $number nm,%, d specimen thickness, mm. 6.2 The uniform value of the change value of three samples was taken as the transmittance change value of the sample. 7 Experimental records and experimental report 7.1 The sample number and the sample unit are recorded on the recorded paper of the spectral transmittance curve. 7.2 Experimental Report: According to the following models and content to fill out the experimental report. Experimental records of transmittance measurement of quartz glass