Processing and characteristics of TiB2 toughened B—Ti—C composites
B-Ti-C composites toughened by TiB2 particles were produced by reaction sintering of B4C, TiC and TiB2 powders. Microstructure and mechanical properties of the composites were studied. A notable improvement on flexure strength and fracture toughness were achieved in B4C composites containing 10%TiB2 and 20%-30%TiC(volume fraction). The highest flexure strength and fracture toughness, 425Mpa and 8.2Mpa*m1/2, respectively, resulted for B4C-10%TiB2-30%TiC composite, are much higher than those for monolithic B4C. The main toughening mechanism is microcrack toughening and crack deflection toughening.
Objective To study the best extracting technology of Compound Taizishen Granule prescription.Methods The total polysaccharides and total saponins were determined by UV spectrophotometer.With the content of total polysaccharides and total saponins as comprehensive indexes,orthogonal test was applied to investigation of the water addition,extraction time,and extraction times for optimizing the best extracting technology.Results The best extracting technology was using 10 times the amount of water,extracting 3 times and 1.5 h per time.Conclusion The extraction technology is safe and effective,which can be used as extraction for Compound Taizishen Granule prescription.