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Ceramic Technology for Beryllium Oxide

#K-505


Development of Technology for Production of Ceramic Articles from Beryllium Oxide by Using the Method of Moulding with Ultrasound

Tech Area / Field

  • MAT-CER/Ceramics/Materials

Status
8 Project completed

Registration date
11.04.2000

Completion date
20.10.2006

Senior Project Manager
Mitina L M

Leading Institute
East-Kazakhstan Technical University, Kazakstan, Ust Kamenogorsk

Supporting institutes

  • Company limited liability Altrade, Kazakstan, Ust Kamenogorsk\nKazakh National University, Kazakstan, Almaty

Collaborators

  • Cranfield University, UK, Swindon\nSandia National Laboratories, USA, NM, Albuquerque

Project summary

The enamelled stoneware ceramics from beryllium oxide is widely used due to its valuable properties such as unique heat conductivity, mechanical strength, chemical resistance and good electric and physical characteristics. Production of enamelled stoneware, heat conductive ceramics from beryllium oxide is a complex technological task. To keep up the complex of properties in the process of production it is necessary to ensure minimum contamination of material by impurities, maximum density and high durability of blanks after formation and burning out of binder.

Currently, the basic formation method of complex ceramic articles from beryllium oxide is the method of thermoplastic slip moulding. The main point of above stated formation method is to give thermoplastic slip the shape of an article when slip fills up formative cavity under pressure and then the regained shape is fixed by changing slip aggregation state in the process of its cooling. The given technology is characterised by relative simplicity of realisation and high efficiency, which is very important for mass production of products. At the same time, creation and realisation of technological process has got an empirical character and was carried out without the detailed analysis of hydrodynamics and heat-and-mass transfer of foundry systems. Therefore the main problem of creation of high technology for quality product manufacturing is the realisation of ultrasonic effect in the process of moulding of thermoplastic slip from beryllium oxide. Research of physical and chemical mechanism of ultrasonic effect at the stages of slip preparation and moulding, determination of optimal conditions by mathematical description allows to find out an effective technical solution.

The proposed project is directed to the solution of the mentioned problem and development of the technology of moulding of thermoplastic slip from beryllium oxide with ultrasound.

The East Kazakhstan Technical University has got vast experience in operations with fine engineering ceramics for machine-building and special designated purpose. Within many years the University has been carrying out the joint work on beryllium ceramics with the city enterprises: Joint-Stock Company «Keramika», Open Joint Stock Company «Ulbinsky Metallurgical Plant». Nowadays all basic developments are concentrated at the University.

Joint-Stock Company «Keramika» is practically the plant of one production: ceramics for radio engineering purposes and beam engineering from beryllium oxide. It has a complete closed circuit of high quality ceramics production. It produces both non metallised, and metallised moulded pieces, and also assembled products with application of mechanised soldering by solid welding alloys.

The Kazak State National University has got long-term experience of research works on hydrodynamics and heat-and-mass transfer of multiphase media. Theoretical estimations and experimental envestigations are carried out in KazSNU. Its scientists obtained important scientific and applied results on the mechanics of multiphase media. The results are published the proceedings and monographs.

The work on the project envisages:

- To investigate the influence of solid phase concentration and temperature on rheological properties and volumetric-phase ratio in the system: beryllium oxide-thermoplastic binder.

- To study the regularities of effect of thermoplastic slip ultrasonic processing on rheological behaviour of moulding systems, consolidation processes and structural - mechanical properties of cast blanks and sintering articles.

- To develop technical solutions for practical realisation of ultrasonic slip activation during moulding and technological principles of construction of acoustic systems of moulding installations.

The experimental research and trial tests will be carried out in EKTU and Joint-Stock Company «Keramika», estimation and theoretical research will be carried out in KazSNU.

For experimental research it is supposed to use ultrasonic rotational viscometer, laboratory model of moulding thermoplastic slip installation from beryllium oxides equipped with a set of special ultrasonic equipment. The pilot industrial test of the developed technology will be carried out using continuous moulding plant of serial production (BChM-1029) with ultrasonic activation.

Heat- and- mass exchange at the stage of preparation in dispersible slip system will be studied using equations of biphase medium. The slurry movement and heat transfer at the stage of mouldings forms filling is goverened by non-stationary equations of continuum medium mechanics with effects of slip crystallisation and hardening with ultrasonic processing.


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