Finally, alumina-based composite materials used for prefabricated iron runner with better ratio of properties and price has been developed by the studying of the properties and microstructure of alumina based composite materials.

Through analgzing the features,formation causes and harm of common quality defects of wharf s embedded members,we put forward corresponding measures,by which a satisfactory result has been achieved.

Methodology research on 3-D braided preform with changed-sections;

Measurement for thickness of carbon fiber three-dimensional braided composite material preforms;

Research on pore-forming materials of preform technology;

T/R module is a key component in phased array radars and requires extremely high performance forpackaging housing materials with light weight, good thermal conductivity, and a low coefficient of thermalexpansion.

It has important relation between composite materials mechanics and perform thickness and irregularity index, but so far the perform thickness is only measured by hand.

The microstructure of the special-shaped 3D braided preforms configurated by reducing-yarn technique is studied by means of experiments and theoretical analysis, in order to set up the braiding technology more strictly.

A study of some sections preforms for compostites produced by weav- ing method has been expounded in the preceding article.

But the volume fraction of particles in composite fabricated by prefabricate method was finite.