A 10 nm nano-silica was introduced to a conventional 3 μm micro-silica composite to develop an eco-friendly new electric insulation material for heavy electric equipment. Thermal and mechanical properties, such as glass transition temperature (Tg), dynamic mechanical analysis, tensile and flexural strength, were studied. The mechanical results were estimated by comparing scale and shape parameters in Weibull statistical analysis. The thermal and mechanical properties of conventional epoxy/micro-silica composite were improved by the addition of nano-silica. This was due to the increment of the compaction via the even dispersion of the nano-silica among the micro-silica particles.

2a SECURITY CLASSIFICATION AUTHORITY 3 DISTRIBUTION IAVAILABILITY OF REPORT N/A Approved for public release; distribution 2b DE CLASSIFICATION / DOWNGRADING SCHEDULEis ul m t d N/A is unlimited. 4 PERFORMING ORGANIZATION REPORT NUMBER(S) S. MONITORING ORGANIZATION REPORT NUMBER(S) HTMIAC Report 9 6a. NAME OF PERFORMING ORGANIZATION 6b OFFICE SYMBOL 7a. NAME OF MONITORING ORGANIZATION High Temperature Materials-(If applicable) Office of the Undersecretary of Defense Mechanical, Electronic and HTMIAC for Acquisition 6c ADDRESS (City, State, and ZIPCode) 7b. ADDRESS (City, State, and ZIP Code)