A national standard for a method of determining the tribotechnical properties of antifriction powder materials

1986 ◽  
Vol 25 (8) ◽  
pp. 684-687
Author(s):  
V. V. Pushkarev ◽  
V. V. Polotai
Keyword(s):  
National Standard ◽  
Powder Materials ◽  
Tribotechnical Properties ◽  
Antifriction Powder

scholarly journals Analysis of operating conditions of heavy-loaded and heat-stressed friction units of powerful internal combustion engines and development of copper nanocomposite powder materials for them

2019 ◽  
Vol 298 ◽  
pp. 00101
Author(s):  
Evgeny Shalunov ◽  
Sergey Shalunov ◽  
Yulia Vladimirova
Keyword(s):  
Internal Combustion Engines ◽  
Linear Thermal Expansion ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Recrystallization Temperature ◽  
Friction Unit ◽  
Powder Materials ◽  
Combustion Engines ◽  
Nanocomposite Powder ◽  
Tribotechnical Properties

The article provides analysis of operating conditions for the «valve – valve guide» heavy-loaded and heat-stressed friction unit of the gas distribution mechanism of powerful internal combustion engines and establishes requirements to materials for valve guides. It describes nanoc omposite materials based on copper powder with aluminum, carbon, iron and oxygen additives developed by the authors of the present article. The reactionary mechanical alloying method and powder metallurgy technologies in use made it possible to develop materials having a dispersion-strengthened structure with nano-disperse level sizes of structural components (dispersoids, subgrains). They have a recrystallization temperature of over 950оС, good therm-conductivity, a low linear thermal expansion coefficient and excellent tribotechnical properties. For example, a copper nanocomposite material containing 0.9 wt % aluminum, 0.3 wt % carbon, 0.4 wt % iron and 0.017 wt % oxygen, by its tribotechnical properties, greatly surpasses CuNi2Si (F65 DIN 17666) bronze widely used by many leading engine-making companies for production of valve guides. By their properties, the developed materials meet requirements that have to be imposed on modern and promising materials for valve guides of powerful internal combustion engines.

scholarly journals RESEARCH OF THE TECHNOLOGY OF OPENING HOLES IN COMPACT AND POWDER MATERIALS

2021 ◽  
Vol 05 (01) ◽  
pp. 51
Author(s):  
Heybet Eldarzade ◽  
Aghali Quliyev ◽  
Aynur Sherifova ◽  
Rafiqa Shahmarova ◽  
Tamilla Xankishiyeva
Keyword(s):  
Cast Iron ◽  
Powder Material ◽  
High Speed ◽  
Small Diameter ◽  
Powder Materials ◽  
Porous Powder ◽  
Small Strains ◽  
Upper Limits ◽  
Antifriction Powder ◽  
Antifriction Powder Material

This article is devoted to one of the important problems of mechanical engineering, including processing by cutting and deploying in sintered antifriction powder material in optimal modes with maximum performance. The study was conducted for small diameter cylindrical bushings. Processing of bushings was carried out by reamers from high-speed and carbide tools on materials from porous powder and cast iron. It is established that the temperature of the tools should not exceed the permissible upper limits, for pressing the bushings, it is necessary to use planting with small strains in the cold state. Keywords: engine valve, bushing, powder material, cast iron, reamer, cold pressing.

scholarly journals TO THE COMPARISON OF TWO METHODS OF MANUFACTURING NEW DRY FRICTION PRODUCTS

2020 ◽  
pp. 34-37
Author(s):  
Yu. Krykhtin ◽  
V. Karlov
Keyword(s):  
Hot Pressing ◽  
Dry Friction ◽  
Powder Materials ◽  
Friction Materials ◽  
Tribotechnical Properties ◽  
Dynamic Hot Pressing ◽  
Manufacturing Methods

The technological indicators of manufacturing methods and the physicotechnical and tribotechnical properties of new dry friction friction products made of friction powder materials based on Fe , two different methods, are used: separate pressing and sintering under pressure and dynamic hot pressing. Approximate dependencies of effect of porosity of friction materials on their tribotechnical properties are obtained.

Structurization in sintering of antifriction powder materials based on iron-copper alloys

2007 ◽  
Vol 46 (11-12) ◽  
pp. 589-594 ◽  
Author(s):  
A. G. Kostornov ◽  
O. I. Fushchich ◽  
T. M. Chevichelova
Keyword(s):  
Copper Alloys ◽  
Powder Materials ◽  
Iron Copper ◽  
Antifriction Powder

Electron microscopy study of shock synthesis of silicides

1993 ◽  
Vol 51 ◽  
pp. 1162-1163
Author(s):  
Kenneth S. Vecchio
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Close Contact ◽  
Microscopy Study ◽  
High Energy ◽  
Electron Microscopy Study ◽  
Powder Materials ◽  
Porous Powder ◽  
Wave Effects ◽  
Wave Passage

Shock-induced reactions (or shock synthesis) have been studied since the 1960’s but are still poorly understood, partly due to the fact that the reaction kinetics are very fast making experimental analysis of the reaction difficult. Shock synthesis is closely related to combustion synthesis, and occurs in the same systems that undergo exothermic gasless combustion reactions. The thermite reaction (Fe2O3 + 2Al -> 2Fe + Al2O3) is prototypical of this class of reactions. The effects of shock-wave passage through porous (powder) materials are complex, because intense and non-uniform plastic deformation is coupled with the shock-wave effects. Thus, the particle interiors experience primarily the effects of shock waves, while the surfaces undergo intense plastic deformation which can often result in interfacial melting. Shock synthesis of compounds from powders is triggered by the extraordinarily high energy deposition rate at the surfaces of the powders, forcing them in close contact, activating them by introducing defects, and heating them close to or even above their melting temperatures.

172. A Canadian National Standard for Official First Responder CBRN PPE

2005 ◽  
Author(s):  
U. Bickis ◽  
T. Beardall ◽  
E. Dickson ◽  
B. Harrison
Keyword(s):  
National Standard ◽  
First Responder
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