Оксид циркония алюминия (Al2Zr3O9)

Description

Aluminum zirconium oxide (zirconium aluminate, Al2Zr3O9) is an inorganic mixed oxide compound of aluminum, zirconium and oxygen. CAS number 70692-95-4, English name Aluminum zirconium oxide (Al2Zr3O9). The formula is written as Al2O3 3ZrO2.

Basic Attributes

• CAS No: 70692-95-4
• Formula: Al2Zr3O9 (Al2O3 3ZrO2)
• Molecular weight: 471.63
• Exact weight: 469.64700
• EU number: 274-757-2
• PSA Specifications: 145.79000

Class of substance and properties

Zirconium aluminate is a technical ceramic oxide of mixed composition. The compound has high heat resistance, chemical resistance and a low coefficient of thermal expansion - a combination of properties typical of mixed alumina and zirconium oxides. These characteristics ensure the material’s resistance to sudden temperature changes (thermal shock) without cracking, which is in demand in high-temperature processes. Compared to pure zirconium oxide, mixed aluminate has a more stable crystal structure during cyclic heating and cooling, which reduces the risk of coating degradation during operation.

Scope of application

Stabilization of zirconium oxide with aluminum inhibits the phase transformations of zirconium dioxide between crystalline modifications during heating and cooling, which in pure ZrO2 are accompanied by a noticeable change in volume and can destroy a ceramic product or coating. The introduction of aluminum into the structure reduces this effect, increasing the operational stability of the material under conditions of multiple thermal cycles.

The main area of ​​use is the ceramic industry and high-temperature coatings:

• component of thermal barrier coatings that provide thermal insulation and protection of parts operating at high temperatures, including gas turbine engine components
• increasing efficiency and extending the service life of coated parts by reducing heat transfer to the metal substrate
• raw materials for the production of technical ceramics with increased resistance to thermal shock

Like other mixed oxides of the aluminum-zirconium system, the material is synthesized by solid-phase sintering or coprecipitation of oxide precursors, followed by heat treatment at high temperatures, which ensures the formation of a stable crystalline structure. The finished powder is used as a raw material for molding technical ceramics blanks or is applied as a coating using spraying methods, after which it undergoes sintering to achieve the required density and mechanical strength of the product. The molar ratio of aluminum and zirconium oxides of 1:3, reflected in the formula Al2Zr3O9, determines the phase ratio in the final ceramics and, accordingly, the balance between heat resistance, strength and thermal expansion coefficient of the finished product.

Storage and handling

There is no special hazard classification according to the GHS in the dump. As a ceramic powder, the substance should be stored in a closed container, in a dry room; when working with the powder, avoid the formation and inhalation of dust; use respiratory protection when crushing and sifting.