INFLUENCE OF POLYMORPHIC TRANSFORMATIONS ON THE POROSITY OF PLASMA-SPRAYED PRODUCTS FROM PURE ALUMINUM OXIDE

被引：0

作者：

Belyaev, Igor ^{[1
]}

Stepnov, Alexey ^{[2
]}

Bazhenov, Viacheslav ^{[3
]}

Pavlov, Artem ^{[4
]}

Kireev, Andrei ^{[1
]}

机构：

[1] Vladimir State Univ, Vladimir, Russia

[2] Res & Prod Enterprise Ctr Plasma Spraying LLC, Vladimir, Russia

[3] Natl Univ Sci & Technol MISiS, Casting Dept, Moscow, Russia

[4] Coating Technol, Vladimir, Russia

来源：

28TH INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS (METAL 2019) | 2019年

关键词：

Plasma sprayed products; aluminum oxide; heat treatment; polymorphic transformations; porosity;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present work, the influence of polymorphic transformations on the porosity of plasma sprayed products produced from pure aluminum oxide was investigated. Scanning electron microscopy, quantitative X-ray diffraction analysis, and X-ray computer tomography are used to quantify the porosity. It was established that the plasma sprayed products is a mixture of a,. and d aluminum oxides with different densities. When heating, these phase modifications undergo the polymorphic transformations which are accompanied by change in the volume. Opposite variations in the volume of the modifications can lead to both decrease and increase in porosity of material as the temperature of heat treatment increases. It was shown that the non-monotonic behavior of temperature dependence of the porosity is shown to be steadily repeated; this is related to the occurrence of polymorphic transformations. This allows us to change purposefully the porosity of plasma sprayed pure aluminum-oxide products by heat treatments.

引用

页码：968 / 972

页数：5

共 14 条

[1] Refractory Ceramic Products from Pure Oxides with Getter Coatings [J].