scholarly journals Technology for producing wear-resistant bimetal bearing based on cast aluminum

2020 ◽  
Vol 164 ◽  
pp. 03045
Author(s):  
Ruslan Kuznetsov ◽  
Evgeniy Ol’khovik ◽  
Mikhail Radkevich ◽  
Pavel Kuznetsov
Keyword(s):  
Liquid Metal ◽  
Cast Alloy ◽  
Applied Pressure ◽  
Base Material ◽  
Outer Radius ◽  
Powder Materials ◽  
Pressing Pressure ◽  
Cast Aluminum ◽  
Sintered Iron ◽  
Wear Resistant

The paper presents the results of research the new technological process for producing bimetallic materials in the composition of “aluminum cast alloy - sintered iron powder” by the method of joint stamping of liquid metal. The purpose of this research is obtain parts with high wear-resistant properties, special sintered powder materials are used, which have an internal porosity to retain lubricant. However, such materials do not fit well with traditional aluminum alloys. This problem is may be solved by creating new bimetallic alloys, part of which is an outer casing, and the other materials is the functional bearing. To accomplish this task, we conducted a study of a new technology for joint stamping of liquid metal. In order to optimize and increase the reliability of the experiment, the pressing pressure, the pressure holding time, and the tooling temperature of the matrix were taken as quantitative factors. The effect of the applied pressure on the mechanical properties of the base material and the facing layer was determined on a longitudinal section of the obtained samples by the Vickers method. It was revealed that the gradient of increasing hardness is directed to the outer radius of the workpiece, that is, to the opposite crystallization front. The high level of bimetal adhesion is explained by the presence of a uniform moderate zone of mutual solubility, including due to the violation of the porous surface layer of the powder billet.

scholarly journals Mechanical Properties of Stoichiometrically Developed Al-Cu-Mg Cast Alloy Under Controlled Environment

2019 ◽  
Vol 31 (9) ◽  
pp. 2009-2014
Author(s):  
Rakesh Kumar ◽  
Varinder Sahni
Keyword(s):  
Mechanical Properties ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Base Material ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
X Ray Diffraction ◽  
Liquid Aluminium ◽  
Selection Of

Present study was carried out to investigate the mechanical properties of newly developed cast aluminum alloy with addition of (1.0 aged heat treatment, AHT %) of copper and (1.0 AHT %) magnesium in the mole ratio of 1:1:1 Al-Cu-Mg in as-cast and thermally aged conditions. The (AHT %) selection of Cu-Mg on the basis of stoichiometric calculations, 1 unit (AHT %) of copper and 1 unit (AHT %) of magnesium were mixed in liquid aluminium base material, heated in an electric furnace and melt was hold at 730 ºC with alloying additions of copper and magnesium for about 30 min to ensure complete homogenisation, Further, this liquidous aluminium metal matrix was stirred at 800 rpm for 5 min and poured at 700 ± 10 ºC in permanent mild steel mould pre-heated at 200 ºC in order to achieve as-cast alloy. Solution treatment at 500 ºC for 1 h and thermally aged at temperature 160 ºC for 5 h was exposed. The effect of solution and aged temperature on metallurgical morphology and further the role of intermetallic compounds on mechanical properties of as-cast alloy have been studied. The optical microscopy and scanning electron microscopy equipped with energy dispersive spectroscopy were used to identify the intermetallic phases and formation of different precipitates was studied by using X-ray diffraction. The improvement in ultimate tensile strength and hardness values have been reported.

Wear-resistant powder materials with intermetallic hardening. I. Nonporous materials for antifriction purposes

1987 ◽  
Vol 26 (4) ◽  
pp. 334-338 ◽  
Author(s):  
G. Kh. Karapetyan ◽  
N. L. Akopov ◽  
F. Kh. Karapetyan ◽  
N. N. Manukyan
Keyword(s):  
Powder Materials ◽  
Wear Resistant

Wear-resistant powder materials with intermetallic precipitation hardening II. Wear-resistant porous materials

1987 ◽  
Vol 26 (5) ◽  
pp. 421-424
Author(s):  
G. Kh. Karapetyan ◽  
N. L. Akopov ◽  
F. Kh. Karapetyan ◽  
N. N. Manukyan
Keyword(s):  
Porous Materials ◽  
Precipitation Hardening ◽  
Powder Materials ◽  
Wear Resistant

Large-area Nanosilver Die-attach by Hot-pressing Below 200°C and 5 MPa

2012 ◽  
Vol 2012 (HITEC) ◽  
pp. 000129-000134 ◽  
Author(s):  
Kewei Xiao ◽  
Jesus N. Calata ◽  
Hanguang Zheng ◽  
Khai D.T. Ngo ◽  
Guo-Quan Lu
Keyword(s):  
Atmospheric Pressure ◽  
Hot Pressing ◽  
Applied Pressure ◽  
Fractional Factorial ◽  
Maintenance Cost ◽  
Pressing Pressure ◽  
Hot Press ◽  
Large Area ◽  
Die Attach ◽  
Temperature Time

Sintered nanoscale silver joint is an emerging lead-free die-attach solution for high-temperature packaging because of silver's high melting temperature. For bonding small chips, the nanosilver solution can be achieved with a simple heating profile under atmospheric pressure. However, for bonding large-area chips, e.g. > 1 cm2 IGBT chips, uniaxial pressure of a few MPa has been found necessary during the sintering stage of the bonding process, which is carried out at temperatures below 275°C. Hot-pressing at high temperatures can cause significant wear and tear on the processing equipment, resulting in high maintenance cost. In this study, we ran a series of experiments aimed at lowering the hot-pressing temperature. Specifically, we examined a process involving hot-press drying, followed by sintering without any applied pressure. A fractional factorial design of experiments was used to identify the importance and interaction of various processing parameters, such as hot-pressing pressure/temperature/time and sintering temperature/time, on the final bond quality of sintered nanosilver joints. Based on the results, a simpler process, consisting of hot-press drying at 180°C under 3 MPa, followed by sintering at 275°C under atmospheric pressure was found to produce attachments with die-shear strength in excess of 30 MPa.

High Temperature Cylinder Sleeve Design Research Self-Lubricating Materials

2014 ◽  
Vol 628 ◽  
pp. 53-58
Author(s):  
Hua Xiang Zhou ◽  
Zheng Zhou ◽  
Jing Ping Liu
Keyword(s):  
High Temperature ◽  
Matrix Material ◽  
Base Material ◽  
Cylinder Liner ◽  
Ceramic Composites ◽  
Hard Material ◽  
Wear Resistant ◽  
Materials Research ◽  
Dual Material ◽  
Cylinder Sleeve

Cylinder Liner design innovation goal is energy conservation. As the main friction parts engine cylinder liner, reducing friction energy is energy saving basic requirements. Materials research cylinder sleeve is one of the main cylinder liner saving research. Through the piston ring and cylinder liner surface friction dual material hard phase, self-lubricating phase, toughening phase analysis, select compatibility, high strength, heat resistance, good high temperature performance, ease of manufacture, price rational matrix material and an appropriate proportion of nanoscale hard material, self-lubricating materials, ductile materials, using appropriate methods cladding and processing, design developed high-temperature self-lubricating cylinder sets of advanced materials. The latest international high temperature, wear-resistant, self-lubricating materials research: modern nanoα-Al2O3+Ni-base alloy composite materials, Ti2B/Fe metal-ceramic composites, metals and ceramics NiCr-Cr3C2 particles CaF2 self-lubricating composite alloy powder material, NiCr/Cr3C2-WS2 self-lubricating wear-resistant materials were studied and found to TiC, Al2O3 is hard reinforcing phase, CaF self-lubricating phase, NiCr/TiC eutectic toughening phase, high-temperature self-lubricating wear-resistant nanocomposite, and Cr18Ni9 class alloy as base material, by laser cladding method enables conventional cylinder liners manufacturing technological breakthroughs, has practical value.

Experimental Research on Mechanical Properties of Polypropylene Flexible Intermediate Bulk Container Base Materials

2013 ◽  
Vol 811 ◽  
pp. 146-151
Author(s):  
Chen Wei Chen ◽  
Fu Xin Yang ◽  
Li Xin Lu ◽  
Jin Xie ◽  
Li Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Low Temperature ◽  
Base Material ◽  
Powder Materials ◽  
Base Materials ◽  
Natural Exposure ◽  
Exposure Experiment ◽  
Tensile Experiment

The Flexible Intermediate Bulk Container (FIBC) is a flexible transportation packaging container that is weaved by polyolefin plastic ribbon-like filament, which is widely used in the storage and transportation of granular and powder materials. When the FIBC was affected by environment factors synthetically under using, such as light, heat and air etc, it would come into degradation and its mechanical properties reduced. In this study, the basic mechanical properties of polypropylene FIBC base material were tested by tensile experiment and the reason of main base material mechanical properties difference between theoretical value and experimental value was analyzed. Based on the FIBC different using environments, the natural exposure experiment and high/low temperature experiments were carried out, we took tensile strength holding ratio and elongation holding ratio as evaluating indicator and analyzed law of influence of the different experiment condition on base material mechanical properties, which provided valuable reference for FIBC designing and manufacturing. Along with the experiment time increased, the color of base material changed from milk white to yellow slowly, the tensile strength and elongation reduced, the influencing grade was as follow: natural exposure>high temperature>low temperature. The results of natural exposure experiment showed that there was difference of anti-aging performance among the FIBC base material, the mechanical properties of woof fabric and belt reduced evidently, while others reduced slowly. For high (45°C)/low (-25°C) temperature experiments, the reduction of FIBC base materials mechanical properties were not obvious and woof fabric reduced a little faster comparatively.

Mechanical Performance of a Cast A354 Aluminium Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 489-494 ◽  
Author(s):  
J.H. Sandoval ◽  
Adel M.A. Mohamed ◽  
S. Valtierra ◽  
F.H. Samuel
Keyword(s):  
Tensile Properties ◽  
Quality Index ◽  
Mechanical Performance ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Test Results ◽  
Cast Aluminum ◽  
Treatment Conditions ◽  
Cast Aluminum Alloys

Cast aluminum alloys are an important group of materials which find wide application in the automotive industry. Insufficient studies have been carried out to date with regard to the mechanical performance of the aged A354 alloy. Therefore, the present work investigates the Quality index charts with the purpose of setting the limits of the tensile properties, as well as for comparing the mechanical behavior of cast alloy A354, to delineate the effect of the solution treatment applied. Tensile properties upon artificial aging in the temperature range of 155–350oC for times ranging from 2 to 100 hours are also investigated. The results showed that the use of quality index charts is a satisfactory method for presenting tensile test results and, for assessing the effect of solution and aging treatment conditions subjected to the modified and grain-refined A354 alloys. It is also observed that the quality index, Q, is more sensitive to variations in the tensile ductility than to tensile strength.

A Comparison of the Tribo-Mechanical Properties of a Wear Resistant Cobalt-Based Alloy Produced by Different Manufacturing Processes

2007 ◽  
Vol 129 (3) ◽  
pp. 586-594 ◽  
Author(s):  
H. Yu ◽  
R. Ahmed ◽  
H. de Villiers Lovelock
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Wear Mechanisms ◽  
Sliding Wear ◽  
Mechanical Performance ◽  
Cast Alloy ◽  
Processing Route ◽  
Structure Property ◽  
Wear Resistant ◽  
The Impact

This paper aims to compare the tribo-mechanical properties and structure–property relationships of a wear resistant cobalt-based alloy produced via two different manufacturing routes, namely sand casting and powder consolidation by hot isostatic pressing (HIPing). The alloy had a nominal wt % composition of Co–33Cr–17.5W–2.5C, which is similar to the composition of commercially available Stellite 20 alloy. The high tungsten and carbon contents provide resistance to severe abrasive and sliding wear. However, the coarse carbide structure of the cast alloy also gives rise to brittleness. Hence this research was conducted to comprehend if the carbide refinement and corresponding changes in the microstructure, caused by changing the processing route to HIPing, could provide additional merits in the tribo-mechanical performance of this alloy. The HIPed alloy possessed a much finer microstructure than the cast alloy. Both alloys had similar hardness, but the impact resistance of the HIPed alloy was an order of magnitude higher than the cast counterpart. Despite similar abrasive and sliding wear resistance of both alloys, their main wear mechanisms were different due to their different carbide morphologies. Brittle fracture of the carbides and ploughing of the matrix were the main wear mechanisms for the cast alloy, whereas ploughing and carbide pullout were the dominant wear mechanisms for the HIPed alloy. The HIPed alloy showed significant improvement in contact fatigue performance, indicating its superior impact and fatigue resistance without compromising the hardness and sliding∕abrasive wear resistance, which makes it suitable for relatively higher stress applications.

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