Measuring method of glass phase components of alumina ceramic

Abstract

The invention discloses a measuring method of the glass phase components of alumina ceramic, comprising the following steps of: (a) taking an alumina block, polishing, washing, and drying to constant weight; (b) slightly boiling the alumina block and the diluted nitric acid for 2 hours, filtering, pouring filter liquor into a volumetric flask, and measuring the volume; (c) titrating aluminum contained in the filter liquor by using a standard EDTA (Ethylene Diamine Tetraacetic Acid) and a copper sulfate solution; (d) titrating calcium contained in the filter liquor by using an EDTA solution; (e) washing sediments, ashing, then adding 3-4 grams of sodium hydroxide for alkali fusion, carrying out cooling extraction, adding concentrated hydrochloric acid, carrying out water bath so that molten materials are dissolved, evaporating at low temperature to small volume, adding a gelatine glue solution, stirring, standing, filtering, sufficiently washing the sediments by using dilute hydrochloric acid, pouring the filter liquor into the volumetric flask, measuring the volume, and repeating the step (d) to measure the calcium contained in the filter liquor; (f) obtaining the content of calcium oxide contained in glass phases through the steps (d) and (e), and obtaining the relative quantity of alumina and the calcium oxide through the steps (c) and (d) so as to obtain the content of the alumina contained in the glass phases; and (g) transferring the sediments obtained from the step (e) to a ceramic crucible with constant weight, ashing, firing to constant weight, and obtaining the content of silicon oxide. The measuring method has the advantages of easiness of operation, low cost and accurate result.

Description

technical field [0001] The invention relates to component analysis of inorganic materials, especially the determination of glass phase content in alumina ceramics. Background technique [0002] The main component of alumina ceramics is α-Al 2 o 3 , people usually put Al 2 o 3 Ceramics with a content greater than 75% are called high alumina porcelain. The mechanical strength of alumina porcelain is particularly high, surpassing ordinary cast iron and cast steel, and the mechanical strength remains basically unchanged at a high temperature of about 1000 °C. Alumina ceramics have small dielectric constant, high volume resistivity, small dielectric loss, and high thermal shock resistance, and almost contain all the good properties that insulating materials used in electronic devices should possess. [0003] The phase structure of alumina porcelain is corundum phase, glass phase and pores. The so-called glass phase is Al 2 o 3 -SiO 2 -The combination of CaO and SiO in po...

AI Technical Summary

Problems solved by technology

[0006] In the compositional analysis of the glass phase in 95 porcelain currently reported, the block test method is difficult to dissolve alumina and calcium oxide in the glass phase during acid treatment, and hydrochloric acid is very volatile during the micro-heating process

In addition, the alumina porcelain is ground into fine powder with a steel bowl. Although the dissolution is good, the actual operation is difficult due to the hardness of the alumina porcelain, and iron impurities are introduced during the experiment, resulting in large errors.