Infiltration of titanium carbide and titanium diboride base cermets with metallic melts

1985 ◽  
Vol 24 (7) ◽  
pp. 553-556 ◽  
Author(s):  
A. A. Kitsai ◽  
T. V. Tsyganova ◽  
S. S. Ordan'yan
Keyword(s):  
Titanium Carbide ◽  
Titanium Diboride ◽  
Metallic Melts

Hydrostatic pressing of a mixture of titanium diboride and titanium carbide powders

1978 ◽  
Vol 17 (4) ◽  
pp. 317-320 ◽  
Author(s):  
R. E. Murashko ◽  
V. N. Sumarokov ◽  
T. A. Bosatina ◽  
V. V. Borisenko ◽  
L. I. Struk ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Titanium Diboride

scholarly journals Degradation of TiB2/TiC Composites in Liquid Nd and Molten NdF3–LiF–Nd2O3 System

2016 ◽  
Vol 35 (10) ◽  
pp. 973-979
Author(s):  
Huihua Wang ◽  
Lijuan Su ◽  
Deyong Wang ◽  
Tianpeng Qu ◽  
Ganfeng Tu
Keyword(s):  
Boundary Layer ◽  
Corrosion Rate ◽  
Grain Boundary ◽  
Titanium Carbide ◽  
Titanium Diboride ◽  
Interfacial Chemistry ◽  
Coherent Interface ◽  
Diffusion Boundary ◽  
Initial Stage ◽  
Boundary Force

AbstractThe degradation of titanium diboride (TiB2)/titanium carbide (TiC) composites in the liquid Nd and molten NdF3–Nd2O3–LiF salts is investigated at 1,060 °C, respectively. The penetration of TiB2/TiC composites by liquid Nd mainly depended on the grain boundaries and residual pores, even if the coherent interface is formed between TiB2 and TiC. The oxidation of TiB2 led to further interfacial chemistry reactions, which speeded up the degradation of TiB2/TiC composites at the initial stage in NdF3 –LiF–Nd2O3 system. After that, the degradation was slowed because of the formation of diffusion boundary layer, and then chemical penetration was replaced gradually by the physical penetration. The dissolved Ti in liquid Nd and NdF3–LiF–Nd2O3 melts are used to evaluate the corrosion rate of TiB2/TiC composites, and the calculated values were about 0.56 and 7.8 mm/year, respectively. After the penetration by liquid Nd and NdF3–LiF–Nd2O3 melts, the bending strengths of TiB2/TiC composites decreased and the fracture mode changed from transgranular to intergranular due to the decreased grain boundary force.

scholarly journals REACTION SYNTHESIS/DYNAMIC COMPACTION OF TITANIUM CARBIDE AND TITANIUM DIBORIDE

1991 ◽  
Vol 01 (C3) ◽  
pp. C3-123-C3-130
Author(s):  
M. A. MEYERS ◽  
J. C. LA SALVIA ◽  
L. W. MEYER ◽  
D. HOKE ◽  
A. NIILER
Keyword(s):  
Titanium Carbide ◽  
Titanium Diboride ◽  
Dynamic Compaction ◽  
Reaction Synthesis

Synthesis of titanium carbide and titanium diboride for metal processing and ceramics production

2021 ◽  
Vol 23 (4) ◽  
pp. 155-166
Author(s):  
Yuri Krutskii ◽  
◽  
Evgeny Maksimovskii ◽  
Roman Petrov ◽  
Olga Netskina ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Boron Carbide ◽  
Titanium Diboride ◽  
Cutting Tools ◽  
Hard Alloys ◽  
Titanium Oxides ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Highly Dispersed

Introduction. Titanium carbide and diboride are characterized by high values of hardness, chemical inertness and for this reason are widely used in modern technology. This paper provides information on the synthesis of titanium carbide and diboride by carbothermal and carbide-boron methods, respectively, on the use of titanium carbide as an abrasive and in the manufacture of tungsten-free hard alloys, carbide steels, wear-resistant coatings, as well as titanium diboride in the production of cutting tools and ceramics based on boron carbide The aim of this work is to study the processes of synthesis of highly dispersed powders of titanium carbide and diboride, which are promising for the manufacture of cutting tools, wear-resistant coatings, abrasives and ceramics. Research methods. Titanium oxide TiO2, nanofibrous carbon (NFC), and highly dispersed boron carbide were used as reagents for the synthesis of titanium carbide and diboride. Experiments to obtain titanium carbide were carried out in a resistance furnace, and titanium diboride in an induction furnace. X-ray studies of the phase composition of titanium carbide and diboride samples were carried out on an ARL X-TRA diffractometer (Thermo Electron SA). The determination of the content of titanium and impurities in the samples of titanium carbide and diboride was carried out by the X-ray spectral fluorescence method on an ARL-Advant'x analyzer. The total carbon content in the titanium carbide samples was determined on an S-144 device from LECO. The content of boron and other elements for titanium diboride samples was determined by inductively coupled plasma atomic emission spectrometry (ICP AES) on an IRIS Advantage spectrometer (Thermo Jarrell Ash Corporation). The surface morphology and particle sizes of the samples were studied using a Carl Zeiss Sigma scanning electron microscope (Carl Zeiss). The determination of the particle/aggregate size distribution was performed on a MicroSizer 201 laser analyzer (BA Instruments). Results. The paper proposes technological processes for obtaining highly dispersed powders of titanium carbide and diboride. The optimum synthesis temperature for titanium carbide is 2,000…2,100 oC, and for titanium diboride 1,600…1,700 oC. The content of the basic substance is at the level of 97.5…98.0 wt. %. Discussion. A possible mechanism for the formation of titanium carbide and diboride is proposed, which consists in the transfer of vapors of titanium oxides to the surface of solid carbon (synthesis of titanium carbide) and vapors of boron and titanium oxides to the surface of solid carbon (synthesis of titanium diboride). Due to the high purity and dispersion values, the resulting titanium carbide powder can be used as an abrasive material and for the manufacture of tungsten-free hard alloys, carbide steels, wear-resistant coatings, and titanium diboride powder can be used for the preparation of cutting tools and ceramics based on boron carbide.

Interface Modification for Fiber-Reinforced Titanium Aluminide Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
Daniel E. Boss ◽  
J. M. Yang
Keyword(s):  
Heat Treatment ◽  
Silicon Carbide ◽  
Aluminum Oxide ◽  
Titanium Carbide ◽  
Titanium Diboride ◽  
Titanium Aluminide ◽  
Chemical Vapor ◽  
Silicon Carbide Fiber ◽  
Gamma Titanium Aluminide ◽  
Before And After

AbstractCandidate diffusion barrier coatings were applied to aluminum oxide and silicon carbide fibers, and consolidated in a gamma titanium aluminide alloy. Interfacial coatings of titanium carbide and titanium diboride were applied to the fibers using chemical vapor deposition, while calcium oxide coatings were applied from a solution. Sections of these specimens were vacuum encapsulated in quartz tubing and heat treated for 50 hours at 1100°C. The thermochemical stability of the fibers was evaluated using energy dispersive x-ray spectroscopy to compare the fiber-matrix interface of the specimens before and after heat treatment. Both the as-manufactured and the coated aluminum oxide fibers showed no discernable interaction with the titanium aluminide matrix. Titanium diboride effectively prevented the silicon carbide fiber from reaction with the matrix. The silicon carbide fiber which was coated with titanium carbide showed significant reaction between the fiber and the coating after heat treatment.

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