scholarly journals Effect of physical and chemical factors, arising in elements of implantation systems, on central screws of heads at rehabilitation of patients in orthopedic dentistry clinic

2020 ◽  
Vol 4 (34) ◽  
pp. 35-39
Author(s):  
S. G. Nikitin ◽  
Yu. Yu. Pervov ◽  
R. A. Saleev ◽  
M. A. Amkhadova
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Phase Composition ◽  
Surface Structure ◽  
Functional Properties ◽  
Tribological Properties ◽  
Biological Media ◽  
Relevant Today ◽  
Chemical Factors ◽  
Physical And Chemical

This article is devoted to the question of one of the remote complications in dental implantology — fracture of the central screw of the abutment. Systematic studies of the influence of chemical and phase composition, volume and surface structure of products from titanium-based alloys on the functional properties of the «implant-screw-abutment» system, including corrosion resistance in biological media, have not been carried out. Therefore, the problem of establishing patterns of influence of these factors on the corrosion resistance of the elements of implantation systems, namely the central screw, and the study of its tribological properties (wear resistance), are relevant today.

scholarly journals Arc Thermal Spray NiCr20 Alloy Coating: Fabrication, Sealant, Heat Treatment, Wear, and Corrosion Resistances

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Van Tuan Nguyen ◽  
Quy Le Thu ◽  
Tuan Anh Nguyen ◽  
Quoc Cuong Ly ◽  
Ly Pham Thi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Phase Composition ◽  
Corrosion Test ◽  
Annealing Temperature ◽  
Alloy Coating ◽  
Aluminum Phosphate ◽  
Annealing Temperatures ◽  
Wear And Corrosion

This study presents the effect of heat treatment on porosity, phase composition, microhardness, and wear and corrosion resistances of the thermal sprayed NiCr20 coating after sealing with aluminum phosphate. The annealing temperatures were varied in a range of 400 to 1000°C. The obtained results indicated the porosity of coating decreased with increasing the annealing temperature. After treatment at temperatures in range of 800-1000°C, more than 90% of initial pores in the coating were successfully filled with the sealants. The XRD data revealed not only the formation of new phases of other compounds, but also the interaction between coating and sealant. After heat treatment, wear resistance of coating was 12 times higher than that without heat treatment. The corrosion test in H2SO4 solution indicated that the presence of sealant in coatings increased their corrosion resistance. From these findings, application of these NiCr20 coatings to protect steel against wear and corrosion appears very promising.

Problems of boxite processing and enrichment, waste management

2018 ◽  
Vol 10 ◽  
pp. 51-55
Author(s):  
O.B. Kotova ◽  
◽  
I.N. Razmyslov
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Waste Management ◽  
Red Mud ◽  
Magnetic Phase ◽  
Raw Materials ◽  
Composition Change ◽  
Chemical Factors ◽  
Similar Density ◽  
Physical And Chemical

The problem of enrichment of aluminum ores is due to the fact that bauxite-forming minerals have similar density, dispersed character and subtle intergrowth. Therefore, the development and improvement of methods for the enrichment and processing of bauxite continue. The work shows the effect of physical and chemical factors on iron minerals with the goal of transforming them into magnetite, to increase the magnetic phase. Influence of various kinds of energetic influences on bauxite raw materials and red mud is established, under which the magnetic properties and phase composition change, the concentrations of certain minerals change.

Comparison of Functional Properties of Thin Layers on Titanium and Cobalt Implant Alloys

2010 ◽  
Vol 297-301 ◽  
pp. 1053-1058 ◽  
Author(s):  
Małgorzata Grądzka-Dahlke
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Tribological Properties ◽  
Titanium Implant ◽  
Orthopedic Implants ◽  
Thin Layers ◽  
Tin Coating ◽  
Matrix Metal ◽  
Implant Alloys

The development of arthroplastics places high demands on the materials used for load-bearing elements of orthopedic implants. The most common of implant materials are titanium and cobalt alloys due to their excellent mechanical properties and biocompatibility. Titanium alloys have desirable properties, such as relatively low modulus, good fatigue strength, formability, machinability, superior corrosion resistance and so are frequently used for long-term implants. However, poor wear resistance limits their application for tribological systems of artificial joints. Research on improvement of titanium alloys tribological properties have been undertaken, mainly by using thin coatings. The TiN-layers are reported to be most promising in biomedical applications such. Many authors stress that application of TiN layer improve wear resistance of titanium implant alloys. Presented work is focused on comparison of effect of TiN coating on properties of TiAlV and CoCrMo implant alloys. The structure, microhardness, corrosion resistance as well as tribological properties were analysed. The research did not confirmed the good properties of titanium alloy with TiN coating. The results show that matrix metal hardness definitely affects the efficiency of TiN layers.

Microstructure and Tribological Properties of Stellite21 Coating by Electro-Spark Deposition

2013 ◽  
Vol 423-426 ◽  
pp. 939-943 ◽  
Author(s):  
Qi Feng Jing ◽  
Ye Fa Tan ◽  
Hui Yong Ji ◽  
Xiao Long Wang ◽  
Li Gao ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Abrasive Wear ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Alloy Coating ◽  
Fatigue Wear ◽  
Compact Structure

Setellite21 cobalt-based alloy coating was deposited on 45 steel by electro-spark deposition. Microstructure and phase composition of the coating were analyzed. Wear resistance and wear mechanism of the coating were researched. The results indicate that the coating with compact structure is mainly composed of Co, Co6W6C, CoCx and CoCr. Average microhardness of the coating is 445.34 HV0.5, which is about 2 times to that of the substrate. The coating presents excellent wear resistance with no obvious peelings and scratches. Wear resistance of the coating is about 2.3~2.7 times to that of the substrate. Wear mechanism of the coating mainly contains abrasive wear and fatigue wear, and along with oxidization wear.

scholarly journals Tribological Properties of Duplex Layers Produced by Vacuum Titanizing Process Combined with the Electrolytic Deposition of Cobalt Alloy

2015 ◽  
Author(s):  
E. Kasprzycka ◽  
B. Bogdanski
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Tool Steel ◽  
Tribological Properties ◽  
Steel Surface ◽  
Electrolytic Deposition ◽  
Cobalt Alloy ◽  
Technological Processes ◽  
Electrolytic Coating ◽  
Steel Surfaces

A new technological processes combining a vacuum titanizing with a preliminary electrolytic deposition of Co-W alloy on the tool steel surface have been proposed to increase the corrosion resistance of carbide layers of TiC type. As a result, duplex layers of TiC+(Co-W) type on the steel surfaces have been obtained. It has been proved, that the wear resistance by friction of these duplex layers, produced by means vacuum titanizing of steel covered with electrolytic coating, is such good as the TiC carbide layers, produced on the steel surface without electrolytic coating, but their corrosion resistance is higher.

scholarly journals Microstructure And Functional Properties Of Prosthetic Cobalt Alloys CoCrW

2015 ◽  
Vol 60 (3) ◽  
pp. 1999-2004
Author(s):  
M. Nadolski ◽  
G. Golański ◽  
J. Klimas ◽  
M. Szota ◽  
J. Szymański
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Ceramic Material ◽  
Functional Properties ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Cobalt Alloys ◽  
Coefficient Of Linear Expansion

AbstractThe material subject to investigation was two commercial alloys of cobalt CoCrW (No. 27 and 28) used in prosthodontics. The scope of research included performing an analysis of microstructure and functional properties (microhardness, wear resistance and corrosion resistance), as well as dilatometric tests. The examined alloys were characterized by diverse properties, which was considerably influenced by the morphology of precipitates in these materials. Alloy No. 27 has a higher corrosion resistance, whereas alloy No. 28 shows higher microhardness, better wear resistance and higher coefficient of linear expansion. Lower value of the expansion coefficient indicates less probability of initiation of a crack in the facing ceramic material.

scholarly journals Effect of Negative Bias Voltage on Tribological Properties under High Relative Humidity Environment and Corrosion Resistance of Boron Carbide Coatings

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1518
Author(s):  
Ping Zhong ◽  
Xueqian Cao ◽  
Lunlin Shang
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Elastic Modulus ◽  
Relative Humidity ◽  
Bias Voltage ◽  
Tribological Properties ◽  
Negative Bias ◽  
Negative Bias Voltage ◽  
Excellent Corrosion Resistance ◽  
Humidity Environment

Humid air is a very important service environment, in which metal friction parts should be enhanced to offer excellent corrosion resistance and wear resistance. The B4C coating is an excellent candidate material to enhance the corrosion resistance and tribological behaviors. The purpose is to investigate the effect of negative bias voltages on the tribological properties of B4C coatings under a high relative humidity environment. Amorphous B4C coatings were successfully prepared by closed field unbalanced magnetron sputtering technology and its microstructure, hardness, elastic modulus, adhesive force and tribological properties were systematically studied. Results demonstrate that the B4C coatings deposited at each negative bias voltage have a columnar structure and the surface roughness remained unchanged (about 1.0 nm), while the thickness, hardness, elastic modulus and adhesion force increase first and then decrease with the negative bias voltage increasing. Among them, the B4C (−50 V) coating showed the best mechanical properties. It should be noted that the B4C (−50 V) coating with an excellent corrosion resistance also exhibits the lowest friction coefficient (~0.15) and wear resistance (7.2 × 10−7 mm3·N−1·m−1) under humid air (85% RH). This is mainly due to the tribochemical reaction of B4C during a sliding process to produce boric acid at the sliding interface. B4C coatings can provide an excellent corrosion resistance and high wear resistance due to their high chemical stability and high hardness.

scholarly journals Effect of the detonation-spraying mode on the tribological properties of NiCr-Al2O3 coatings

2021 ◽  
Vol 5 (1) ◽  
pp. 39-44
Author(s):  
B.K. Rakhadilov ◽  
D.B. Buitkenov ◽  
E. Kabdykenova ◽  
Zh.B. Sagdoldina ◽  
L.G. Zhurerova
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Tribological Properties ◽  
Volume Fraction ◽  
Oxygen Mixture ◽  
High Wear Resistance ◽  
Wear Volume ◽  
Detonation Spraying ◽  
Filling Volume ◽  
Study Results

The article presents the study results of detonation spraying parameters on the phase composition and tribological properties of NiCr-Al2O3 powder coatings. The spraying was carried out at a ratio of the acetylene-oxygen mixture O2 /C2H2=1.856. The detonation barrel filling volume with an explosive gas mixture varied from 30% to 68%. It is determined that the phase composition of the NiCr-Al2O3 coatings varies depending on the degree of detonation barrel filling. With an increase in the detonation barrel’s filling volume, the intensity of the NiCr diffraction peaks is decreased, and the intensity of the a-Al2O3 reflexes is increased, which indicates an increase in the content of the Al2O3 phase. When low filling volume, there is determined a low coating density and uneven roughness. The tribological test results showed that with an increase in the detonation barrel filling volume, there is a decrease in the wear volume, which confirms the increase in the coatings wear resistance. Determined that the lowest friction coefficient was recorded in the sample obtained at the barrel filling volume 68%. The coatings’ high wear resistance is associated with an increase in the alpha phase volume fraction of a-Al2O3 and coatings density.

REYNOLDS 390 and A390

Alloy Digest ◽  
1971 ◽  
Vol 20 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
High Hardness ◽  
Heat Treating ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Temperature Performance

Abstract REYNOLDS 390 and A390 are hypereutectic aluminum-silicon alloys having excellent wear resistance coupled with good mechanical properties, high hardness, and low coefficients of expansion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, and machining. Filing Code: Al-203. Producer or source: Reynolds Metals Company.

RED X-20

Alloy Digest ◽  
1960 ◽  
Vol 9 (2) ◽  
Keyword(s):  
Wear Resistance ◽  
Thermal Expansion ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Coefficient Of Thermal Expansion ◽  
Heat Treating ◽  
Aluminum Silicon Alloy ◽  
Temperature Performance

Abstract RED X-20 is a heat treatable hypereutectic aluminum-silicon alloy with excellent wear resistance and a very low coefficient of thermal expansion. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-89. Producer or source: Apex Smelting Company.

Sign in / Sign up

Export Citation Format

Share Document