Skip to main content
main-content
Top

About this book

This book presents the most important thermochemical and physical techniques of boriding. The formation and characterization of different boride layers or boride coatings are compared in this book. The author analyzes the technological aspects of boriding processes, presenting the advantages and disadvantages of each method. The effect of the boriding techniques on the microstructure of borided materials are also indicated. The mechanism of formation of active boron atoms or ions and the phenomena during re-melting of alloying material together with the substrate are described. Special attention is devoted to powder-pack boriding, electrochemical boriding in borax, gas boriding, plasma gas or paste boriding and laser or plasma surface alloying with boron, acknowledged as the most important current methods in boriding. The thermodynamics of gas boriding is also analyzed.

Table of Contents

Frontmatter

Chapter 1. Introduction

In this chapter, the origins of boriding process were mentioned, and the term ‘boriding’ was explained. The various important techniques of producing the boride layers and coatings were indicated together with some of their advantages. The next parts of this book were announced.
Michal Kulka

Chapter 2. Classification of Boriding Techniques

The simplified classification of the techniques of boriding was presented in this chapter. The two main groups of the methods were indicated: chemical techniques and physical techniques regarding the technological aspects of boriding process. Such a classification was based on how to produce the active atoms or ions of boron, which might be adsorbed on the surface of metal alloys and could diffuse into the substrate. The most intensively developed techniques were put in the boxes drawn in a broken line, indicating the current trends in boriding.
Michal Kulka

Chapter 3. Borided Materials

All the materials, subjected to boronizing using different techniques, were indicated in this chapter. They were classified into two main groups: iron alloys and non-ferrous materials. The preliminary analysis of the produced microstructure was presented. The most popular materials with boride layers were marked with the boxes drawn in a broken line. Boride coatings could be produced on any metal alloy under certain conditions.
Michal Kulka

Chapter 4. Trends in Thermochemical Techniques of Boriding

All the specified thermochemical techniques of boriding in solid, liquid and gaseous media were characterized and compared in this chapter based on the available literature data. The technological aspects of boriding processes were analyzed, taking into consideration the advantages and disadvantages of each method. The effects of the boriding techniques on the microstructure of borided materials have been indicated. The mechanism of formation of active boron atoms was described. Some issues of the thermodynamics of gas boriding were analyzed. The chemical techniques of boriding were divided into the three groups: boriding in solid media, boriding in liquid media and boriding in gaseous media (see Fig. 2.​1). Due to the need of using the elevated temperature during these processes, they were usually recognized as thermochemical techniques. In the present work, the most intensively developed techniques, put in the boxes drawn in a broken line in Fig. 2.​1, were described in more detail, taking into account the current trends in boriding. Therefore, the most attention in this chapter was devoted to the powder-pack processes, electrochemical boronizing in borax as well as to the gas boronizing with the use of boron halides or boranes.
Michal Kulka

Chapter 5. Trends in Physical Techniques of Boriding

All the specified physical techniques of boriding, i.e. carried out under glow discharge conditions, boron ion implantation and high-energy techniques were characterized and compared in this chapter based on the available literature data. The technological aspects of boriding processes were analyzed, taking into consideration the advantages and disadvantages of each method. The effects of the boriding methods on the microstructure of borided materials were shown. The mechanism of formation of active boron atoms or ions and the phenomena during re-melting of alloying material together with the substrate were described. The three main groups of physical techniques of boriding were specified: boriding under glow discharge conditions, boriding by ion implantation and the high-energy methods of boriding. The most intensively developed physical techniques were put in the boxes drawn in a broken line in Fig. 2.​1. They were described in more detail, taking into account the current trends in boronizing. Hence, the most attention was devoted to the boriding under glow discharge conditions, especially plasma gas (or paste) boriding, and surface alloying with boron, especially, laser (or plasma) surface alloying.
Michal Kulka

Chapter 6. Developmental Prospects of Boriding

All the types of microstructure of surface layers with boron were classified. The boriding techniques, resulting in the formation of these types of microstructure, were specified. The developmental prospects of the boriding process were formulated by indicating the most attractive techniques, taking into account their most important features and possibility of their use for boriding of a wide range of materials.
Michal Kulka

Backmatter

Additional information

Premium Partner

image credits