High-Temperature Oxidation of ZrB2–MoSi2–AlN Composite Ceramics

Powder Metallurgy and Metal Ceramics - The oxidation mechanism of ZrB2–MoSi2–AlN composite ceramics has been studied in the range 1550–1680°C. The oxidation stages and scale...     

Synthesis Features,Structure, and Properties of Promising High-Temperature Ceramics in the Hf–Ta–B–Ti–Si System

Russian Journal of Non-Ferrous Metals - This study covers the elemental synthesis features of Hf–Ta–B–Ti–Si ceramic materials used to obtain promising high-temperature...     

Electrical Properties of Highly Absorbing Ceramics in the AlN–SiC System

Powder Metallurgy and Metal Ceramics - The electrical properties of two highly absorbing AlN–SiC composites are compared at a frequency of 10.3 GHz. To estimate the dielectric constant and...     

Electrochemical Corrosion of Composite Ceramics and Thermal Spray Coatings in the ZrB2–SiC–AlN System

Powder Metallurgy and Metal Ceramics - Polarization studies of the ZrB2–SiC–AlN compact ceramic material and thermal spray coatings of the same composition were conducted in a 3% NaCl...     

The Possibility of Dense Materials Based on Obtaining an AlN–SiC Solid Solution by Self-Propagating High-Temperature Synthesis Gasostating

Russian Journal of Non-Ferrous Metals - The synthesis and sintering of the (AlN)x(SiC)1 – x solid solution have been studied under conditions of self-propagating high-temperature synthesis...     

Influence of the Concentrate of Rare-Earth Elements on the Stabilization of High-Temperature Phases and Properties of the ZrO2–7Y2O3-Based Ceramics

Russian Journal of Non-Ferrous Metals - Powders based on the ZrO2–7 wt % Y2O3 system, into which oxides of rare-earth elements (REE)—La, Nd, and Pr—were introduced in the form of...     

Synthesis of the ZrN–ZrB2 Composite by Spark Plasma Sintering

Powder Metallurgy and Metal Ceramics - Reactive spark plasma sintering of ZrH2, BN, and B powder mixtures in the temperature range 1500–1900°C was used to produce a ZrN–ZrB2...     

Heretophase Ceramics in the Hf–Si–Mo–B System Fabricated by the Combination of SHS and Hot Pressing Methods

Russian Journal of Non-Ferrous Metals - This work is devoted to the fabrication of heterophase powder and consolidated ceramics based on hafnium and molybdenum borides and silicides by combining...     

Self-Propagating High-Temperature Synthesis of the Heterophase Materials in the Zr–Mo–Si–B System: Kinetics and Mechanisms of Combustion and Structure Formation

Russian Journal of Non-Ferrous Metals - The paper is devoted to the study of the combustion kinetics and mechanisms of elemental mixtures in the Zr–Mo–Si–B system, as well as the...     

Mechanical and Corrosion Properties of ZrB2–SiC Composite Ceramics with Oxide Additions

Powder Metallurgy and Metal Ceramics - Hot pressing was used to produce compact ceramic samples with the following composition (wt.%): 60 ZrB2 + 20 SiC + 20 (Al2O3 + 32 t-ZrO2). The tetragonal...     

Peculiarities of Granulation of the PAP-2 Aluminum Powder in the Technology of the Al–Al2O3 Powder Composite with a Layered Structure

Russian Journal of Non-Ferrous Metals - An analysis of modern scientific-and-technical information evidences great prospects for using composite materials (CMs) based on the Al–Al2O3 system....     

Structure,Properties, and Oxidation Resistance of Prospective HfB2–SiC Based Ceramics

Russian Journal of Non-Ferrous Metals - This work is devoted to the fabrication of heterophase powdered and sintered ceramics based on the hafnium diboride and silicon carbide by means of...     

Fabrication of in situ TiB2–TiC reinforced steel matrix composites by spark plasma sintering

Abstract

In situ TiB₂ and TiC particulates reinforced steel matrix composites have been fabricated using cheap ferrotitanium and boron carbide powders by spark plasma sintering (SPS) technique. The sintering behaviour and the formation mechanism of the composite were studied. The results show that when the composite was sintered at 1050°C for 5 min, the maximum relative density and hardness of the composite are 99·2% and 83·8 HRA respectively. The phase evolution of the composite during sintering indicates that the TiB₂ and TiC reinforcements were formed in situ as follows: first, the solid/solid interface reaction between Fe₂Ti and B₄C, resulting in the formation of a small amount of TiB₂ and TiC below 950°C; second, the solid–liquid solution precipitation reaction in the Fe–Ti–B–C system, resulting in the formation of the main TiB₂ and TiC reinforcements at ～1000°C.     

Synthesis and properties of ceramics in the SiC — B4C — MeB2 system

The effect of impurities and additives of titanium and zirconium borides on the structure and mechanical properties of SiC — B₄C ceramics over a broad temperature range has been investigated. The ceramics was fabricated by hot pressing without a protective medium. Introduction of borides is accompanied by improvement in all the studied mechanical properties at room temperature, and the nature of hardening of the ceramics is practically independent of the type of SiC powders used. At high temperatures, the mechanical behavior of the ceramics is determined by the impurity composition: the ceramics obtained using abrasive powders loses strength beginning at 600°C, while using powders with decreased impurity content makes it possible to preserve the strength of the material up to a temperature of 1400°C. Translated from Poroshkovaya Metallurgiya, Nos. 5–6(413), pp. 29–42, May–June, 2000.     

Effect of Electric Current Passing Through the Interface on the Wetting of ZrO2 Ceramics with Silver–Copper–Oxygen Melt in Air

Powder Metallurgy and Metal Ceramics - The wetting of ZrO2 ceramics with Ag–Cu–O melts in air when electric current passes through th interface has been studied. Special samples were...     

Structural and Phase Transformations in Plasma-Spray ZrB2–SiC–AlN Coatings on a C/C–SiC Substrate After High-Temperature Thermal Cyclic Heating

Powder Metallurgy and Metal Ceramics - The composition and structure of a plasma-spray coating produced from a 60ZrB2 + 20SiC + 20AlN (wt.%) composite powder on a C/C–SiC substrate were...