On some distinctive features of the structure of composite ceramic materials obtained by the method of directed reaction impregnation

On some distinctive features of the structure of composite ceramic materials obtained by the... The method of directed reaction impregnation (DRI), known as a Lanxide process in foreign countries, provides a wide spectrum of ceramic composite materials with a variable content of metallic phase, which possess high physicomechanical properties. An important advantage of the method is the absence of shrinkage, which diminishes substantially the amount of heat-treatment rejects and the cost of the finishing mechanical treatment. The structural characteristics of composites obtained by impregnation of the pore space of \-SiC and A12O3 ceramic matrices with an aluminum alloy with 5 wt.% Si and 2 wt.% Mg are presented. The former matrix is obtained by free pouring of a granular powder of silicon carbide, and the latter matrix is represented by a densely sintered alumina preform with through cylindrical channels. The process is conducted at 1150 – 1200‡C for 24 h in air. The structure of the composites bears Al2O3 crystals and a mixed Al/Al2O3 phase formed from the metallic melt. The microhardness of the phases that compose the structure of the composite with a silicon carbide matrix is determined (HV = 28.4 – 73.2 GPa for Al2O3,HV = 10.3 – 19.7 GPa for SiC, andHV = 0.5 – 0.8 GPa for A1/A12O3). Directed reaction impregnation through cylindrical channels of the aluminum oxide matrix yields highly porous fibers with a typical dimple structure. The impregnation process in this composite is considered from the standpoint of equilibrium (the Le Chatelier principle). Its occurrence in different stages is considered from the standpoint of thermodynamics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

On some distinctive features of the structure of composite ceramic materials obtained by the method of directed reaction impregnation

Loading next page...
Springer US
Copyright © 2001 by Kluwer Academic/Plenum Publishers
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
Publisher site
See Article on Publisher Site


You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.



billed annually
Start Free Trial

14-day Free Trial