Lead-free low-temperature glass for manufacturing diode glass shell

[0022] The technical solutions of the present invention will be specifically described by the following examples, and the content of the present invention is not limited by the following examples.

[0023] In the present invention, the glass samples are melted by means of a high-temperature electric furnace in the laboratory, and the raw materials used are high-purity ore raw materials or chemically pure reagents, such as the introduction of SiO 2 of high-purity quartz sand, the introduction of B 2 O 3 boric acid, introducing P 2 O 5 of ammonium dihydrogen phosphate, the introduction of carbonates of alkali metal oxides and alkaline earth metal oxides, the introduction of Al 2 O 3 of aluminum hydroxide, introducing TiO 2 Titanium oxide, zinc oxide introduced with ZnO, etc., with the help of a small amount of Sb 2 O 3 The combined action of nitrate and nitrate to achieve clarification of glass liquid. The batches of each component are put into a platinum crucible and melted into a glass sample in a high-temperature electric furnace. Pour the melted uniform glass liquid onto the preheated stainless steel mold to form block glass, then anneal at a temperature about 10°C higher than its transition temperature for 2 hours, and then close the muffle furnace to cool with the furnace.

[0024] After the annealed glass is heated and melted on a gas lamp, glass filaments with a diameter of 0.55 to 0.75 mm and a length of 235 mm are drawn, and the softening temperature of the glass sample is measured according to the ASTM C338 standard; the drawn size is approximately The cylindrical glass rod of the -7 /K, 30~300℃); the drawn size is approximately The cylindrical glass rods are used to measure the acid corrosion resistance of glass.

[0025] Considering that the temperature of the electroplating solution during diode electroplating is room temperature, and the electroplating time does not exceed 1 hour, in the present invention, in order to ensure that the invented glass composition can well withstand the erosion of the electroplating solution during the electroplating process, the acid corrosion resistance of the glass is adopted. The evaluation standard is: take 200ml of electroplating solution in a beaker, put The glass rod was immersed in the plating solution, after which the beaker was sealed and placed in an oven at 50 °C for 1 hour. After that, the glass rod was washed and dried, and the morphology of the glass rod after being eroded by the electroplating solution was observed under an electron microscope with a magnification of 100 times. "√" indicates that the surface of the glass rod has maintained the original appearance after erosion, and there is no obvious crack; "×" indicates that there is obvious crack on the surface of the glass rod after erosion.

[0026] In Table 1, the numbered "Examples 1-3" are three examples of the present invention, and the numbered "Comparative Example" is the lead-free low-temperature glass described in Chinese Patent CN 1850681A (publication number). The content of the ingredients is expressed in weight percent.

[0027] In order to illustrate the advantages of the lead-free low-temperature glass of the present invention, three important parameters of the three example glasses and the comparative example glasses are given in Table 2:

[0028] 1 - Softening temperature, corresponding to the temperature at which the glass filament is elongated at a rate of 1 mm/mm under a softening point tester.

[0029] 2-Expansion coefficient, the average linear expansion coefficient of the glass rod in the range of 30~300℃.

[0030] 3- The acid corrosion resistance, the change of the surface morphology of the glass rod after immersion in the electroplating solution.

[0031] Table 1

[0032]

[0033] Table 2

[0034]