当前位置: X-MOL 学术Powder Metall. Met. Ceram. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Structural Model of Two-Component Particulate Mixtures with Maximum Heterogeneous Contacts
Powder Metallurgy and Metal Ceramics ( IF 1 ) Pub Date : 2020-07-01 , DOI: 10.1007/s11106-020-00144-7
D. V. Khantadze , G. F. Tavadze , A. S. Mukasian

Heterodiffusion processes or chemical reactions in heterogeneous media are initiated at contact points between dissimilar particles of the reagents. Therefore, the number of heterogeneous contacts in the starting mixture is assumed to determine the rate of these processes: in particular, the rate of mass transfer in self-propagating high-temperature synthesis. The conditions for obtaining structures with maximum heterogeneous contacts have not been clearly defined so far in the literature. The paper determines for the first time the optimal ratio of particle sizes for a two-component mixture. This ratio contributes to the starting mixture composition that involves the maximum number of dissimilar contacts at a given weight or volume content of the reagents. A model of two-component densely packed disordered biparticulate granular media is proposed. According to the model, the starting mixture is considered a random packing of spherical particles of two sizes. The particle size ratio has been established so that the number of heterogeneous contacts between the particles of different phases is the highest. The concept of an ideal reaction area, which is a biparticulate structure consisting of the maximum number of dissimilar particles, has been developed and the role of the starting particle size composition in the formation of such structure has been established. An algorithm is presented for calculating the characteristics of the starting mixture to promote the structure with ideal reaction areas.

中文翻译:

具有最大异质接触的两组分颗粒混合物的结构模型

异质介质中的异质扩散过程或化学反应在不同试剂颗粒之间的接触点处开始。因此,假设起始混合物中多相接触的数量决定了这些过程的速率:特别是自蔓延高温合成中的传质速率。迄今为止,文献中还没有明确定义获得具有最大异质接触的结构的条件。该论文首次确定了双组分混合物的最佳粒径比。该比率有助于起始混合物组合物,该组合物在给定的试剂重量或体积含量下涉及最大数量的不同接触。提出了一种双组分密集无序双颗粒介质模型。根据该模型,起始混合物被认为是两种尺寸的球形颗粒的随机堆积。已建立的粒度比使得不同相的颗粒之间的异质接触数量最高。理想反应区的概念是由最大数量的异种粒子组成的双粒子结构,已经被开发出来,并且已经建立了起始粒度组成在形成这种结构中的作用。提出了一种计算起始混合物特性的算法,以促进具有理想反应面积的结构。已建立的粒度比使得不同相的颗粒之间的异质接触数量最高。理想反应区的概念是由最大数量的异种粒子组成的双粒子结构,已经被开发出来,并且已经建立了起始粒度组成在形成这种结构中的作用。提出了一种计算起始混合物特性的算法,以促进具有理想反应面积的结构。已建立的粒度比使得不同相的颗粒之间的异质接触数量最高。理想反应区的概念是由最大数量的异种粒子组成的双粒子结构,已经被开发出来,并且已经建立了起始粒度组成在形成这种结构中的作用。提出了一种计算起始混合物特性的算法,以促进具有理想反应面积的结构。已经开发并且已经确定了起始粒度组合物在形成这种结构中的作用。提出了一种计算起始混合物特性的算法,以促进具有理想反应面积的结构。已经开发并且已经确定了起始粒度组成在形成这种结构中的作用。提出了一种计算起始混合物特性的算法,以促进具有理想反应面积的结构。
更新日期:2020-07-01
down
wechat
bug