Deposition of superhard Ti-C-N plasma coatings in nitrogen atmosphere

2020 ◽  
Vol 5 ◽  
pp. 44-48
Author(s):  
D.Yu. Gerasimov ◽  
◽  
A.A. Sivkov ◽  
Keyword(s):  
Substrate Surface ◽  
High Hardness ◽  
Coherent Scattering ◽  
Plasma Coating ◽  
Coherent Scattering Region ◽  
Nitrogen Atmosphere ◽  
Titanium Carbonitride ◽  
Crystalline Phases ◽  
Plasma Coatings ◽  
Operation Cycle

The possibility of obtaining a superhard plasma coating based on titanium, nitrogen and carbon on a metal substrate in a nitrogen atmosphere is shown. The coatings were deposited in one short-term accelerator operation cycle under the action of a hyperspeed jet of electroerosive Ti-containing plasma on the substrate surface. It has been shown by SEM and XRD that nanostructured layers of titanium nitride and titanium carbonitride are formed, providing a high hardness of the coating. Plasma coatings deposited in a nitrogen atmosphere have a higher hardness (19.6 GPa) than coatings deposited in air (16.2 GPa), which is due to a higher content of nitride crystalline phases in the coating material. XRD data showed that the coherent-scattering region of crystalline phases in coatings deposited in an atmosphere of air and in a nitrogen atmosphere is ~10-40 nm, which confirms the nanostructuring of all crystalline phases presented in the coating.

Study of corrosion resistance of doped surface layer with CuSn—CrxCy composition after plasma hardening

2021 ◽  
pp. 215-220
Author(s):  
Nguyen Van Trieu ◽  
N.A. Astafeva ◽  
A.E. Balanovsky ◽  
A.N. Baranov
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Chromium Content ◽  
High Hardness ◽  
Plasma Coating ◽  
Corrosion Current ◽  
Ph Values ◽  
Alloyed Surface ◽  
Welding Electrode ◽  
Acidity Parameter

In the process of plasma surface hardening, coatings based on a mixture of CuSn alloy and 10/20 % OK 84.78 additive with high hardness were obtained. The study of the microstructures of the coatings showed that the content of the austenite phase decreases with an increase in the content of chromium carbide in the composition. The influence of the acidity parameter on the corrosion resistance of the alloyed surface layer with the composition of the mixture of alloys CuSn and the coating of the welding electrode OK 84.78 was evaluated. Corrosion control in 3% NaCl solutions with different pH values showed that the plasma coating has high corrosion resistance at pH = 7 and decreases by 2 times at pH = 3. An increase in the chromium content leads to an increase in the corrosion potential, and the presence of cracks leads to an increase in the corrosion current density.

Formation of boride layers on a commercially pure Ti surface produced via powder metallurgy

2021 ◽  
Vol 112 (4) ◽  
pp. 303-307
Author(s):  
Yavuz Kaplan ◽  
Mehmet Gülsün ◽  
Sinan Aksöz
Keyword(s):  
Powder Metallurgy ◽  
Substrate Surface ◽  
High Hardness ◽  
Titanium Boride ◽  
Boride Layer ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Commercially Pure ◽  
Boriding Process

Abstract In this study, powder metallurgy was applied in a furnace atmosphere to form titanium boride layers on a commercially pure Ti surface. Experiments were carried out using the solid-state boriding method at 900 °C and 1000°C for 12 h and 24 h. Samples were produced by pressing the commercially pure Ti powders under 870 MPa. The sintering process required by the powder metallurgy method was carried out simultaneously with the boriding process. Thus, the sintering and boriding were performed in one stage. The formation of the boride layer was investigated by field emission scanning electron microscopy, optical-light microscopy, X-ray diffraction, and elemental dispersion spectrometry analyses. In addition, microhardness measurements were performed to examine the effect of the boriding process on hardness. The Vickers microhardness of the boronized surface reached 1773 HV, which was much higher than the 150 HV hardness of the commercially pure Ti substrate. The X-ray diffraction analysis showed that the boriding process had enabled the formation of TiB and TiB2 on the powder metallurgy Ti substrate surface. Consequently, the production of Ti via powder metallurgy is a potentially cost-effective alternative to the conventional method, and the boriding process supplies TiB and TiB2 that provide super-high hardness and excellent wear and corrosion resistance.

Structural-phase State of a High-hardness Heatresistant Alloy Formed by Plasma Cladding in a Nitrogen Atmosphere and High-Temperature Tempering

2020 ◽  
Vol 62 (10) ◽  
pp. 1865-1870
Author(s):  
N. N. Malushin ◽  
D. A. Romanov ◽  
A. P. Kovalev ◽  
V. L. Osetkovskii ◽  
L. P. Bashchenko
Keyword(s):  
High Temperature ◽  
Phase State ◽  
Structural Phase ◽  
High Hardness ◽  
Nitrogen Atmosphere ◽  
Structural Phase State ◽  
Plasma Cladding

The Influence of Degree of Polymerization on Precursor-Derived Si-B-C-N Ceramics

2010 ◽  
Vol 650 ◽  
pp. 355-360
Author(s):  
Xiang Geng ◽  
X. Huang ◽  
Ya Jing Li ◽  
Song Li ◽  
Xiao Bin Shi
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Amorphous Materials ◽  
Chemical Properties ◽  
Temperature Stability ◽  
High Hardness ◽  
Nitrogen Atmosphere ◽  
Degree Of Polymerization ◽  
Pyrolysis Process ◽  
High Temperature Stability

Precursor derived Si-B-C-N ceramic is a kind of amorphous materials with high hardness, low density, durability at extremely high temperature. The materials show a great potential to be used in the field of the Thermal Protective System (TPS). The physical states and chemical properties of the amorphous materials greatly depend on the starting materials. The effect of degree of polymerization (DP) of the precursor on the pyrolysis process and the characteristics of the amorphous Si-B-C-N materials are studied. The SiBCN-based preceramic polymer synthesized by dichloromethylvinylsilane, ammonia and BH3•SMe2. Dichloromethylvinylsilane reacted with ammonia and BH3•SMe2 in toluene or tetrahydrofuran (THF) as solvent in the presence of catalytic amounts of pyridine. The polymeric precursors were cured at low temperature to obtain solid-state precursors. Pyrolysis process of the solid-state precursors under various temperatures and carried out in nitrogen atmosphere. The results showed that DP of the precursor influences the pyrolysis process and the high temperature stability of the Si-B-C-N amorphous ceramics.

Synthesis of nanocrystalline titanium carbonitride during milling of titanium and carbon in nitrogen atmosphere

2009 ◽  
Vol 470 (1-2) ◽  
pp. 369-374 ◽  
Author(s):  
Feng-shi Yin ◽  
Li Zhou ◽  
Zhi-feng Xu ◽  
Bing Xue ◽  
Xue-bo Jiang
Keyword(s):  
Nitrogen Atmosphere ◽  
Titanium Carbonitride ◽  
Nanocrystalline Titanium

The Effect of Mixed Abrasive Slurry on CMP of 6H-SiC Substrate

2008 ◽  
Vol 569 ◽  
pp. 133-136 ◽  
Author(s):  
Ho Jun Lee ◽  
Boum Young Park ◽  
Hyun Seop Lee ◽  
Suk Hoon Jeong ◽  
Heon Deok Seo ◽  
...  
Keyword(s):  
Removal Rate ◽  
Substrate Surface ◽  
High Hardness ◽  
Wide Band ◽  
Mechanical Polishing ◽  
Chemical Effect ◽  
Wide Band Gap ◽  
Mechanical Removal ◽  
Device Applications ◽  
Mechanical Factors

Silicon carbide (SiC) is a wide band gap semiconductor being developed for high temperature, high power, and high frequency device applications. For the manufacturing of SiC to semiconductor substrate, many researchers have studied on the subject of SiC polishing. However, SiC faces many challenges for wafer preparation prior to epitaxial growth due to its high hardness and remarkable chemical inertness. A smooth and defect free substrate surface is important for obtaining good epitaxial layers. Therefore, hybrid process, chemical mechanical polishing (CMP) has been proposed to achieve epi-ready surface. In this paper, the material removal rate (MRR) is investigated to recognize how long the CMP process continues to remove a damaged layer by mechanical polishing using 100 nm sized diamond, and the authors tried to find the dependency of mechanical factors such as pressure, velocity and abrasive concentration using single abrasive slurry (SAS). Especially, the authors tried to get an epi-ready surface with mixed abrasive slurry (MAS). The addition of the 25nm sized diamond in MAS provided strong synergy between mechanical and chemical effects resulting in low subsurface damage. Through experiments with SAS and MAS, it was found that chemical effect (KOH based) was essential and atomic-bit mechanical removal was efficient to remove residual scratches in MAS. This paper concluded that SiC CMP mechanism was quite different from that of relatively soft material to achieve both of high quality surface and MRR.

TITANIUM CARBONITRIDE COATINGS PREPARED BY REACTIVE PLASMA SPRAYING Ti POWDERS

2007 ◽  
Vol 14 (02) ◽  
pp. 171-177 ◽  
Author(s):  
LIN ZHU ◽  
JINING HE ◽  
DIANRAN YAN ◽  
YANCHUN DONG ◽  
LISONG XIAO
Keyword(s):  
Plasma Spraying ◽  
Vickers Microhardness ◽  
Indentation Size Effect ◽  
High Hardness ◽  
Titanium Carbonitride ◽  
Chemical Information ◽  
Resistant Material ◽  
Reactive Plasma Spraying ◽  
Reactive Plasma ◽  
Ticn Coating

Titanium Carbonitride ( TiCN ), a new high hardness and wear-resistant material, has been applied widely in many fields. TiCN coating was first fabricated using reactive plasma spraying (RPS) technology in the reactive chamber that was filled with nitrogen and acetylene ( N 2 and C 2 H 2) in this study. The microstructure and the phase composition of the coatings were analyzed by SEM and XRD. More chemical information of surface was analyzed by XPS. The Vickers microhardness of TiCN coating is 1659.11 HV 100 g , and the cross-section of the coating shows a conspicuous phenomenon of indentation size effect.

Highly Transparent Y-α-Sialon by Hot Pressing

2011 ◽  
Vol 148-149 ◽  
pp. 599-602
Author(s):  
Ying Chun Shan ◽  
Hui Ye ◽  
Jiu Jun Xu ◽  
Jiang Tao Li
Keyword(s):  
Hot Pressing ◽  
Single Phase ◽  
Near Infrared ◽  
Wavelength Region ◽  
High Hardness ◽  
Optical Transmittance ◽  
Nitrogen Atmosphere ◽  
Infrared Wavelength ◽  
Dense Microstructure ◽  
Equiaxed Grain

The single-phase Y-α-sialon ceramics with highly optical transmittance were produced by hot pressing starting mixtures of Si3N4, AlN, Al2O3and Y2O3at 1900 °C for 0.5 h in a nitrogen atmosphere. The resultant sialon shows very high optical transparency in the near infrared wavelength region, about 70% for 0.8 mm thickness. In addition to highly transmittance, the Y-α-sialon also show high hardness (19 GPa) and well fracture toughness (4 MPa•m1/2), which attribute to the compound microstructure of uniform, equiaxed grain with a grain size of 2 μm and small aspect ration elongated α-sialon (<2) with a length no more than 5 μm. The high transparent was attribute to the uniform dense microstructure and pure single-phase α-sialon.

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