A kind of preparation method of high thermal stability feldspar ceramic blank and product thereof

Abstract

The invention discloses a feldspathic ceramic blank with high thermal stability, which includes a base material and additives; the base material is composed of 25-35 wt% of Inner Mongolia potassium feldspar, 20-35 wt% of French Imerys kaolin, and 18-35 wt% of Guangxi Beihai porcelain clay. 25 wt%, 10-20 wt% of fused silica, 3-8 wt% of apatite, and 1-5 wt% of serpentine; the additive is yttrium-stabilized zirconia micropowder, and its dosage is 1-3% wt of the base material. In addition, a preparation method of a high thermal stability feldspar ceramic product is also disclosed. The invention realizes particle dispersion, toughening and strengthening through additives and optimization of the formula system, and forms low-expansion crystals and solid solutions in situ, thereby effectively improving the thermal shock resistance of the feldspar porcelain. The invention has easy-to-obtain raw materials and low price, and realizes fast burning at low temperature, thereby reducing the cost of raw materials, achieving the purpose of energy saving and emission reduction, being convenient for production and implementation, and beneficial to industrialization promotion and application.

Description

technical field [0001] The invention relates to the technical field of daily-use ceramics, in particular to a preparation method of a feldspathic ceramic blank and a product thereof. Background technique [0002] Feldspar porcelain is a "feldspar-quartz-kaolin" three-component system porcelain with feldspar as a flux. It is characterized by white porcelain, translucent, compact cross-section, low water absorption, good light transmittance, chemical Good stability. At present, the light transmittance requirements for feldspar porcelain are relatively high, even reaching the light transmittance of bone china, in order to meet the requirements of product quality and the needs of users. However, good light transmittance must generate more glass phases, that is, more feldspars need to be introduced, which brings about the problem of poor thermal stability of the porcelain body. The reason is that the single low-temperature flux K in the billet 2 O, Na 2 The increase of O will...

AI Technical Summary

Problems solved by technology

However, good light transmittance must generate more glass phases, that is, more feldspars need to be introduced, which brings about the problem of poor thermal stability of porcelain bodies.

The reason is that the single low-temperature flux K in the billet 2 O, Na 2 The increase of O will lead to the sudden appearance of a large amount of liquid phase when the body temperature reaches the lowest eutectic point temperature, with less mullite crystals and more free quartz, thereby increasing its expansion coefficient, and it will crack once heat exchanged at 150-20°C, so , has become a major problem that the existing technology urgently needs to solve

[0003] In order to solve the above problems, high-sanoptic porcelain has also been researched and developed at present. Under the condition of meeting the requirements of light transmittance, its thermal stability can reach 180-20°C without cracking once, but it is still not up to European and American countries and countries. The electrical industry has high requirements for no cracking at 230-20°C

In addition, in actual production, the formula and process adopted by the enterprise are not easy to control, and it is easy to cause fewer mullite crystals. The main crystal component is cristobalite, so the expansion coefficient is larger, resulting in greater internal stress in the porcelain body. Greatly affect the performance and qualification rate of the product

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