The most important exothermal reactions in the crust can be expected from the chemical transformations of sulfides . 地壳中能够料想到的最重要的放热化学反应是硫化物的化学转变。
2.
At the some time , the reaction between ti and al also is an exothermal reaction , so the inner energy is increased sharply which prompt al3ti to decompose and the diffusion rate of ti toward graphite particles and the decrease the inoculation tune 同时加镁后生成的tic颗粒的扩散速率增大，因而增大了tic颗粒的形核数，使生成的tic颗粒更加细小弥散，在复合材料中的所占体积分数增大。
3.
Before 900 c , ti reacts with al to form tial intermetallics ; above 900 c , c reacts with remain ti to form tic triggered by the exothermal reaction of ti and al ; tial reacts with tic to produce dense tial / ti2alc composites 间的放热反应引发c和未反应完全的ti反应生成tic ; tiai金属间化合物和tic反应并合成致密tiai / tizaic复合材料。通过保温阶段， tizaic长成层状多品结构，同时复合材料致密化。
4.
Abstract : the preparation conditions of unsaturated polyester ( up ) resins modified by pet were introduced in this paper . the copolymerization mechanisms of the synthesis of up resins from cis - and trans - anhydride were researched . the relationship between the modified resins activities and the structure of unsaturated acids were also discussed . the reason for the differences of the exothermal curves of the two resin systems was that the activity of the cis - and trans - unsaturated bonds was different from each other 文摘:本文研究了由聚酯改性合成不饱和聚酯树脂的反应机理和工艺条件，讨论了改性树脂反应活性与不饱和酸结构之间的关系，解释了顺、反式双键结构对改性树脂固化放热特性和反应活性不同的原因。
