The goal of this book is to describe basic approaches to modelling non-isothermal interaction kinetics during CS of advanced materials and reveal the existing controversies and apparent contradictions between different theories, on one hand, and between theory and experimental data, on the other hand, and to develop criteria for a transition from traditional solid-state diffusion-controlled phase formation kinetics (a 'slow', quasi-equilibrium interaction pathway) to non-equilibrium, 'fast' dissolution-precipitation route.
Author(s): B. B. Khina
Series: Chemistry Research and Applications Series
Publisher: Nova Science Pub Inc
Year: 2010
Language: English
Pages: 123
Tags: Топливно-энергетический комплекс;Топливо и теория горения;Исследования процессов горения и взрыва;
COMBUSTION SYNTHESIS OF ADVANCED MATERIALS......Page 2
DEDICATION......Page 8
CONTENTS......Page 10
PREFACE......Page 12
1.1. APPROACHES TO MODELING NON-ISOTHERMAL INTERACTION KINETICS DURING CS......Page 14
1.2. BRIEF REVIEW OF DIFFUSION-BASED KINETIC MODELS OF CS......Page 23
2.1. INTRODUCTION......Page 26
2.2. SCENARIO 1: GROWTH OF S TIC CASE ON THE TITANIUM PARTICLE SURFACE......Page 28
2.3. SCENARIO 2: GROWTH OF A TIC LAYER ON THE SURFACE OF SOLID CARBON PARTICLES......Page 29
2.4. DIFFUSION DATA FOR TIC......Page 30
2.5. TEMPERATURE OF THEREACTION CELL IN THE SHS WAVE......Page 32
2.6. ADIABATIC HEAT RELEASE IN THE REACTION CELL......Page 33
2.7.1. Analytical Solution to Scenario 1......Page 34
2.7.2. Results of Calculations for Scenario 1......Page 35
2.8. RUPTURE OF THE PRIMARY TIC SHELL......Page 37
2.9.1. Analytical Solution to Scenario 2......Page 39
2.9.2. Results of Calculations for Scenario 2......Page 40
2.9.3. Displacement of the C/TiC Interface in the “Emptying-Core” Mechanism......Page 42
2.9.4. Product Porosity in the “Emptying-Core” Mechanism......Page 43
2.10. ANALYSIS OF THE “SHRINKING-CORE” MECHANISM IN THE TI-C SYSTEM......Page 45
2.11. PHASE-FORMATION-MECHANISM MAP FOR NON ISOTHERMAL INTERACTION IN THE TI-C SYSTEM......Page 47
3.1. INTRODUCTION......Page 52
3.2.1. Thermal Aspect......Page 55
3.2.2. Phase Composition of the Reaction Zone......Page 57
3.3.1. Structure of the Model......Page 59
3.3.2. Quasi-Isothermal Submodel......Page 60
3.3.3. Non-Isothermal Submodel......Page 63
3.3.4. Sequence of Calculations......Page 66
3.4.1. Densities of Phases......Page 67
3.4.2. Interdiffusion Parameters......Page 68
3.5.1. Evolution of the Phase Layers......Page 72
3.5.2. Estimation of Critical Heating Rates......Page 78
3.6. PHASE-FORMATION-MECHANISM MAP FOR NON ISOTHERMAL INTERACTION IN THE NI-AL SYSTEM......Page 81
3.7. CONCLUSION: ROLE OF PHASE-FORMATION MECHANISMMAPS IN THE CS OF ADVANCED MATERIALS......Page 84
4.1. INTRODUCTION......Page 88
4.2.1. Mechanical Activation vs. Mechanical Alloying......Page 90
4.2.2. Numerical Estimation of Stored Energy in Metals......Page 91
4.3. ANALYSIS OF EXISTING KINETIC THEORIES OF MA-SHS......Page 96
4.4. RELAXATION OF NON-EQUILIBRIUM VACANCIES IN NON-ISOTHERMAL CONDITIONS......Page 100
4.5. A POSSIBLE PHYSICAL MECHANISM OF THE EFFECT OF MECHANICAL ACTIVATION ON CS......Page 103
REFERENCES......Page 106
INDEX......Page 118
