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Glass-Solders with Prescribed Properties

#A-1357


Designing and Synthesis of Glass-Solders with Prescribed Properties

Tech Area / Field

  • MAT-COM/Composites/Materials

Status
3 Approved without Funding

Registration date
26.10.2005

Leading Institute
Institute of Electronic Materials, Armenia, Yerevan

Collaborators

  • Loughborough University, UK, Loughborough\nInstitut für Fügetechnik und Werkstoffprüfung GmbH, Germany, Jena\nCNRS / Université de Rennes 1, France, Rennes\nAFO Research, Inc., USA, CA, Glendale\nBundesanstalt für Materialforschung und prüfung, Germany, Berlin

Project summary

Glass-solders as well as glass-enamels, glass-cements and glass-ceramics are used in many fields of science and technology for achieving vacuum-tight junction of heterogeneous construction materials for interlayer insulation of hybrid chips, sealing of electro-lead-ins of vacuum devices and ceramic frames of microcircuitry. They are also applied in the process of preparation of dielectric, resistance and conducting pastes of wide use and dielectric, protective and decorative coats of metals and alloys.

Glass-enamels, glass-cements and glass-ceramics are similar to inpidual compounds by their composition and properties. In most cases the glass-solders are compositions, consist of noncrystallized glass and crystalline fillers. So depending on properties and concentration of their components the properties of glass-solders may vary on a large scale. This permits to standardize approaches for designing and synthesis of glass-solders compositions with prescribed properties, which is the final goal of the present project.

As a rule, numerous contradictory requirements are imposed on glass-solders. The basic requirements of them are: high wettability of soldering materials, thermal and chemical compatibility among them, as well as certain temperature of soldering, certain mechanical, thermal, chemical, electrical, technological and performance attributes. Many of these parameters are defined by properties of base-glass, which in its turn predetermines the choice of crystalline additives aimed at the adjustment of compositions properties. Considering this, the first task of the project is the selection of the basic base-glasses for the synthesis of several glass-solders groups with thermal expansion coefficient (TEC) within (5 ÷ 120) x 10-7K-1 and temperature of soldering (Tsold) within 350 ÷ 1200 oC. These values are peculiar to most of construction materials (glass-ceramics, quartz, high-silica and borosilicate glasses, ceramics, steel, heat-resistant alloys).

The next important task of the project would be the selection of crystalline additives, their concentration and sizes of particles for each glass-solders group. It is supposed that glass-solder compositions developed on the basis TEC and Tsold will be pided into following main groups:

I group: TEC= (60÷120)x10-7К-1, Tsold= (350÷500) ºС;

II group: TEC= (30÷60)x10-7К-1, Tsold = (450÷650) ºС;

III group: TEC = (5÷30)x10-7К-1; Tsold = (600÷1200) ºС;

Further on, in each glass-solders group demonstrative compositions which correspond to the boundary values of TEC and Tsold will be synthesized. Practical compositions may be synthesized and available upon a customer’s request (if any).

In the process of work the important physical-chemical, technological and operational properties of basic glass-groups, crystalline fillers and glass-solders, influence of nature and sizes of particles, concentration of components and technical parameters on the basis properties of obtained composition will be determined. The glass-solders of practical purpose will be tested accordingly to technical requirements introduced by an interested organizations.

As a result of the project realization, the following outcomes will be achieved:

  • basic properties of various groups and compounds of glass-solders and the materials analyzed as base-glasses and modifying additives, in the form of tables and graphs.
  • alterations of basic properties of base-glasses due to presence of different additives and changes in their concentrations, sizes of particles, glass-solders synthesis modes and operational conditions, in the form of graphs and empiric equations.
  • recommendations on designing and synthesis of solder-glass compositions meant for vacuum-tight soldering of materials with the TEC (5 - 120) х 10-7К-1 and the temperature of soldering (350 - 1200) ºС, developed as design equations, tables and graphs
  • compounds and laboratory technologies of glass-solders synthesis meant for demonstration testing of the developed recommendations as well as addressing particular practical issues.
  • pilot lots of the developed glass-solders in the amount of 1-2 kg meant for testing by an interested party.

We hope that the reference material concerning the most promising components and the recommendation for designing and synthesis of glass-solders will be of use for both consumers and developers of such materials. The former may use them while developing technical requirements applicable in practice, whereas the latter would refer to them in the process of development of compounds and synthesis technologies while working on the required materials to tight deadlines.

The solder compositions obtained as a result of project implementation can be used beyond their direct application as part of electrical, thermal, chemical, mechanical safeguard of various construction elements, as well as in the process of development of dielectric, resistant and conducting pastes in many fields of science and technology.

Experimental glass-solders consignment will be used in the search of interested organizations and partners for next project stage and for preliminary product marketing.

The theoretical significance of the project is the enrichment of knowledge about glasses and glass-ceramic, ceramic and composition materials by new experimental data and by establishment of interrelation between them.

The content of the project and staff involvement fully comply with the goals and objectives of ISTC.

The project matter is in the scope of scientific interests and possibilities of the Leading implementing institution. The manager, principal and many potential employees of the project possess long-term experience of work with glasses and glass-solders materials aimed in particular for potting of microcircuits and hermetically input, for obtaining of thermal-shock resistant protective and dielectric coverings, resistive and conducting pastes. Many of materials developed in the Institute, were standardized, released and used by the various enterprises of former Soviet Union. Approximately 200 proceedings and inventions concerning glasses, glass-solders and composition materials and related to the topic of the present project were published by the employees of Institute. All aforementioned adds up to the confidence of achieving positive outcomes of the project.

We would like to ask all the interested scientific and industrial enterprises and organizations, as well as scientists and specialists from the EU, USA, Canada, Japan, South Korea, and Norway to support the implementation of the present project with participation in it as foreign collaborators or partners. The glass-solders, in which they would be interested, will be included in the project for development and pilot lots production.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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