scholarly journals A Study on the Joining Technology of Copper-Aluminium Composite Heat-Dissipating Components

2021 ◽  
Vol 16 (2) ◽  
pp. 066-069
Author(s):  
Yanfei Bian ◽  
SHI Jian-zhou ◽  
XIE Ming-jun ◽  
CAI Meng
Keyword(s):  
Heat Dissipation ◽  
Weak Link ◽  
Chemical Properties ◽  
Dissimilar Materials ◽  
Aluminium Composite ◽  
Joining Technology ◽  
Aluminium Copper ◽  
Physical And Chemical ◽  
Composite Heat ◽  
And Chemical Properties

Copper-aluminium composite heat dissipation components have both the high thermal conductivity of copper and the low density of aluminium. Copper and aluminium are dissimilar materials as they have significant differences in physical and chemical properties, and hence it is not easy to weld them together. In this paper, the joining of copper to aluminium is studied by using the ultrasonic brazing technique. The results show that the copper and aluminium can be connected by ultrasonic brazing, and it is found that the bonding of the copper side interface is the weak link of the entire joint, but the joint strength can still reach 95MPa.

Kesan Bentuk Hujung Elektrod Terhadap Kimpalan Rintangan Bintik Mikro Sambungan Titanium-Nikel

2014 ◽  
Vol 69 (1) ◽  
Author(s):  
Hussain Zuhailawati ◽  
Emee Marina Salleh ◽  
Alaa Muhsin Saeed
Keyword(s):  
Spot Welding ◽  
Failure Load ◽  
Chemical Properties ◽  
Dissimilar Materials ◽  
Base Metals ◽  
Microstructural Characteristics ◽  
Similar Materials ◽  
Physical And Chemical ◽  
Alloy Filler ◽  
And Chemical Properties

Micro resistance spot welding of dissimilar materials is more challenging than that of similar materials due to differences in physical and chemical properties of the base metals. Fortunately, the incorporation of filler alloys at the interfaces of the two overlapped dissimilar metals can successfully overcome this difficulty. This study evaluated the mechanical behavior and microstructural characteristics of titanium-to-nickel spot-welded with and without the incorporation of 71Ag-28Cu-1Mg using round, rectangular and ring-shaped tip electrodes. Results showed that the round electrode gave the joints with the highest failure load and microhardness values since its highest current density produced a smaller contact area with the workpieces, causing the deepest penetration of the welded nugget. Addition of Ag-Cu-Mg alloy filler during spot welding improved weldability over that of joints made without filler. 

Study on the effect of different combinations of engine coolant additives on the heat dissipation rate of radiators

2005 ◽  
Vol 219 (10) ◽  
pp. 1173-1179 ◽  
Author(s):  
P L Sathyanarayanan ◽  
R Ramprabhu
Keyword(s):  
Heat Dissipation ◽  
Waste Heat ◽  
Potassium Dichromate ◽  
Pure Water ◽  
Chemical Properties ◽  
Weather Conditions ◽  
Ambient Temperatures ◽  
Physical And Chemical ◽  
Engine Coolant ◽  
And Chemical Properties

The performance, reliability, and life of a diesel engine largely depend on its efficiency to dispose waste heat under all weather conditions, especially at high ambient temperatures. The coolant of the engine plays a significant role in removing a major portion of this heat from the engine. Although pure water is the most efficient of all, it is essential to add certain additives to modify some of its deleterious actions on the engine and its components. For a given radiator configuration, the effectiveness of a coolant in dissipating heat is primarily governed by its composition and thereby its physical and chemical properties. Thus, a study on the effects of different combinations of engine coolant additives on the extent of heat dissipation was carried out. The study mainly concentrated on the use of cutting oil, ethylene glycol, and three-component additives (sodium nitrate, potassium dichromate, and trisodium phosphate), which were carefully analysed in a laboratory and compared on the basis of their respective performances.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

THE IMPORTANCE OF THE RED BOOK OF SOILS FOR MONITORING AND JUSTIFICATION OF CONSERVATION MEASURES

2020 ◽  
Author(s):  
O.S. Bezuglova ◽  
Keyword(s):  
Chemical Properties ◽  
Natural State ◽  
Soil Maps ◽  
Rostov Region ◽  
Conservation Measures ◽  
Background Data ◽  
The Russian Federation ◽  
Physical And Chemical ◽  
And Chemical Properties

Rostov Region belongs to the highly protected natural territories characterized by the continuous plowing. There territories are the only reserves with the soils preserved in their natural state. However, these areas often lack detailed information about the soils quality and composition. Surveying soils on these territories is crucial for determination of their basic physical and chemical properties. The resulted compilation of soil maps could lay a foundation for creating the Red Book of Soils and the formation of a section in the soil-geographical database of the Russian Federation. Subsequently, such information can be used as a background data for the main types of soils in the region. It will be also valuable during monitoring and justification of conservation measures.

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