{"id":1280,"date":"2019-09-20T15:11:50","date_gmt":"2019-09-20T13:11:50","guid":{"rendered":"http:\/\/www.baikowski.com\/?page_id=1280"},"modified":"2026-05-15T15:02:17","modified_gmt":"2026-05-15T13:02:17","slug":"cmc-ceramic-matrix-composite-page","status":"publish","type":"page","link":"https:\/\/www.baikowski.com\/en\/cmc-ceramic-matrix-composite-page\/","title":{"rendered":"CMC – Ceramic Matrix Composite (FAQ)"},"content":{"rendered":"

Frequently Asked Questions about CMCs<\/h2>\n

🔬 Ceramic Matrix Composites (CMCs) for High-End and Sustainable Applications<\/strong>
\nCMCs are advanced structural materials that delvier superior performance for many high-end applications, like in aerospace engines, automotive components, heat shields, energy systems, and industrial insulation. Baikowski superior Ox\/Ox CMCs solutions offer excellent thermal and chemical stability with good mechanical properties, particularly in oxidizing environments<\/strong>.<\/p>\n

✅<\/strong>What is a CMC material?<\/strong><\/h2>\n
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Scanning Electron Microscopy (SEM) of a CMC piece<\/figcaption><\/figure>\n

A Ceramic Matrix Composite (CMC)<\/span> is a ceramic matrix coupled with embedded ceramic fibers. This unique association of materials revolutionized the aerospace industry<\/a>, making parts more resistant to extreme conditions, including oxidizing atmosphere, and lighter compared to the previous technologies. CMC materials prevail over most of the drawbacks of conventional technical ceramics, which are low fracture toughness, limited thermal shock resistance & brittle failure.<\/p>\n

Baikowski\u00ae develops special submicronic high purity alumina and mullite<\/a> solutions for\u00a0oxide-oxide CMC<\/strong>s, such as BA15-PSS, SM8 and SLAz<\/strong>, a\u00a0high-purity\u00a0fine alumina doped with nanozirconia.<\/p>\n

Our engineered solutions ensure excellent infiltration, controlled porosity, fine microstructure, and reliable performance<\/strong> in extreme environments.<\/p>\n

✅<\/strong>What are the Properties of the ceramic matrix composites?<\/strong><\/h2>\n

CMC technology was developed to face extreme conditions, thanks to its remarkable properties:<\/p>\n

    \n
  • Thermal resistance<\/strong>: while technical ceramics are proven thermal insulators, CMC is adding dimensional components (namely fibers, matrix and pores) that enhance the resistance to thermal shocks.<\/li>\n
  • Lightweight<\/strong>: compared with the previous composite technologies used in extreme environment, a CMC part is much lighter. For example, it is 1\/3 the weight of nickel superalloys for a similar part.<\/li>\n
  • Improved engine efficiency:<\/strong>\u00a0by enabling components to operate at higher temperatures and requiring less cooling air in engine hot sections, CMCs can contribute to improved fuel efficiency and reduced emissions, depending on the overall engine design.<\/li>\n
  • Fracture toughness<\/strong>: CMC material is less brittle than a conventional technical ceramic, since fibers contribute to bridge the cracks<\/li>\n
  • Electrical insulation<\/strong>: oxide CMCs show dielectric transparency, unlike other types of CMCs.<\/li>\n
  • Chemical stability<\/strong>: High Purity Alumina matrix shows excellent corrosion resistance against most chemicals<\/li>\n<\/ul>\n

    Those properties are strengthened by Baikowski\u2019s control of particle size & size distribution<\/strong> in the delivered products (d50<0.2\u00b5m). Moreover, we deliver a wide product range (powder & slurry), with high chemical purity, 100% \u03b1 alumina. Our slurries are provided with high solid content<\/strong>.<\/p>\n

    Indicative comparison of main CMC families<\/strong><\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n
    CMC Type<\/strong><\/td>\nCarbon\/Carbon<\/strong><\/td>\nCarbon\/SiC<\/strong><\/td>\nSiC\/SiC<\/strong><\/td>\nOx\/Ox<\/strong><\/td>\n<\/tr>\n
    Fiber<\/strong><\/td>\nCarbon<\/td>\nCarbon<\/td>\nSiC<\/td>\nAlumina, Mullite, Quartz<\/td>\n<\/tr>\n
    Fiber tensile strength (GPa)<\/strong><\/td>\n4\u20137<\/td>\n4<\/td>\n2.7<\/td>\n3 \u2014 Al2<\/sub>O3<\/sub>
    \n2 \u2014 Mullite
    \n1.5 \u2014 Quartz<\/td>\n<\/tr>\n
    Fiber cost (\u20ac\/kg)<\/strong><\/td>\n20\u201350<\/td>\n20\u201350<\/td>\n1,000\u201320,000<\/td>\n600\u2013800<\/td>\n<\/tr>\n
    Density (g\u00b7cm\u22123<\/sup>)<\/strong><\/td>\n1.4\u20131.7<\/td>\n1.8\u20132.8<\/td>\n2.3\u20132.9<\/td>\n2.1\u20132.8<\/td>\n<\/tr>\n
    Environment<\/strong><\/td>\nNot for use in oxidizing atmosphere<\/td>\nProtection is necessary in oxidizing atmosphere<\/td>\nOxidizing atmosphere allowed<\/td>\nOxidizing atmosphere allowed<\/td>\n<\/tr>\n
    Creep resistance<\/strong><\/td>\n++++<\/td>\n+++<\/td>\n+++<\/td>\n+ \u2014 Alumina
    \n++ \u2014 Mullite<\/td>\n<\/tr>\n
    Maximum operating temperature (\u00b0C)<\/strong><\/td>\n2,000\u20132,100<\/td>\n1,350\u20132,100<\/td>\n1,100\u20131,600<\/td>\n900\u20131,300<\/td>\n<\/tr>\n<\/thead>\n<\/table>\n<\/div>\n