Preparation of Controlled Microporous High Speed Steel and its Composite Self-Lubrication Materials

2011 ◽  
Vol 295-297 ◽  
pp. 16-20
Author(s):  
Yan Jun Wang ◽  
Li Ying Yang ◽  
Bin Wang ◽  
Shou Ren Wang
Keyword(s):  
High Speed ◽  
Friction And Wear ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Sintering Process ◽  
Vacuum Sintering ◽  
Pressure Infiltration ◽  
Microstructure Effects ◽  
Pin On Disk ◽  
Composite Self

High speed steel (HSS) with controlled micropores was prepared via vacuum sintering process, using the mixture of stearic acid, TiH2 and CaCO3 compound as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preform with 60Pb40Sn40-15Ag-0.5RE solid lubricants to create self-lubrication composite where both solid lubricant phase and matrix phase were interpenetrating throughout the microstructure. Effects of pore-forming agent on micropore structure and porosity of the prepared microporous HSS preforms were investigated. The scanning electron microscope (SEM) observation was applied to the test samples and it revealed that the micropores of the microporous materials exhibited a uniform distribution and the apertures were of almost same size in principle. The friction and wear behaviors of the composite sliding against ZrO2 ceramic under a load of 50 N at 600 °C were investigated using a pin-on-disk wear tester and the results showed that this kind composite possessed excellent high temperature self-lubrication properties.

Fabrication and Tribological Properties of High Temperature Self-Lubrication Composites Prepared by Gas-Pressure Infiltration Technique

2011 ◽  
Vol 306-307 ◽  
pp. 802-807
Author(s):  
Yan Jun Wang ◽  
Bin Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang
Keyword(s):  
Friction And Wear ◽  
Elevated Temperatures ◽  
Normal Load ◽  
Solid Lubricants ◽  
Pressure Infiltration ◽  
Wear Rates ◽  
Metal Ceramic ◽  
Infiltration Technique ◽  
Pin On Disk ◽  
Lubricating Properties

Powder metallurgy derived microporous Al2O3/FeCrWMoV metal ceramic preforms were infiltrated with 60Pb40Sn based solid lubricants to create almost fully dense self-lubrication composites. By means of scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS), it was found that 60Pb40Sn-based solid lubricants are well dispersed and embedded in the Al2O3/FeCrWMoV matrix. The friction and wear behaviors of the composites sliding against ZrO2 ceramic from ambient to 800 °C were investigated using a pin-on-disk wear tester.The results showed that the composites exhibited self-lubricating properties at elevated temperatures up to 700 °C. The friction coefficients of less than 0.27 at 600 °C and wear rates of 6×10−6 mm3/N m are obtained when rubbing against ZrO2 ceramic under a normal load of 50 N and a sliding speed of 0.139m/s for 2 hours. The occurrences of lower friction coefficient and plateau in wear rate have been related to the formation of a film of lubricant almost covered entirely the substrate beneath.

Microstructure Development and Properties of HSS-Based Self-Lubrication Composites

2011 ◽  
Vol 217-218 ◽  
pp. 625-630 ◽  
Author(s):  
Yan Jun Wang ◽  
Bin Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang
Keyword(s):  
Wear Rate ◽  
High Speed ◽  
Volume Fraction ◽  
Tribological Behavior ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Minor Importance ◽  
Crushing Strength ◽  
Pressure Infiltration ◽  
Micropore Structure

High speed steel based ceramic preforms with three-dimensionally interpenetrated micropores were fabricated using the mixture of TiH2, CaCO3 and stearic acid as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preforms with Pb-Sn based solid lubricants to create almost fully dense self-lubrication composites. The microstructure and properties of HSS-based self-lubrication composites were investigated as a function of sintered porosity. A quantitative analysis of microstructure was correlated with crushing strength，microhardness and wear rate to understand the influence of pore size, shape and distribution on mechanical and tribological behavior. Crushing strength and microhardness decreased with an increase in porosity. Meanwhile the decrease in microhardness with increasing porosity was slightly. The friction coefficient of HSS-based self-lubrication composites decreased with increasing the volume fraction of lubricant due to the self-lubrication and unique micropore structure. Within the range of lubricant volume fraction from 0% to 14%, the wear rate of the composites decreased steadily with the increase of lubricant content in the composites. Micropore structure and lubricant volume fraction play an important role in determining wear resistance of the composites whereas the measured bulk properties seem to be of minor importance.

Automation of calculations of cutting modes taking into account the wear of cubic boron nitride tools when applying solid lubricants

2021 ◽  
pp. 67-70
Author(s):  
Keyword(s):  
Boron Nitride ◽  
High Speed ◽  
Solid Lubricant ◽  
Cubic Boron Nitride ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Ceramic Bond ◽  
Calculation System

The effect of a solid lubricant on the wear of cubic boron nitride grinding wheels on a ceramic bond of different hardness and grain size in the processing of high-speed steel is investigated. The dependences of the change in the wear of cubic boron nitride on the parameters of the processing mode are determined. An automated calculation system is proposed to control the consumption of cubic boron nitride grinding wheels in production conditions. Keywords: solid lubricant, grinding, high speed steel, cubic boron nitride grinding wheel, consumption, wear, grinding mode. [email protected]

Investigation on Wear Behavior at High Temperature of Smooth and Bionic Non-Smooth Samples

2012 ◽  
Vol 157-158 ◽  
pp. 1628-1631
Author(s):  
Xiao Dong Yang ◽  
Zhuo Juan Yang ◽  
You Quan Chen
Keyword(s):  
High Temperature ◽  
Wear Mechanism ◽  
High Speed ◽  
Room Temperature ◽  
Wear Behavior ◽  
High Speed Steel ◽  
Wear Test ◽  
Test Method ◽  
Wear Characteristics ◽  
Pin On Disk

By using pin-on-disk wear test method, the wear behavior of W9Gr4V high speed steel with smooth and non-smooth concave samples which treated by laser texturing technology was investigated between room temperature and 500 . It was found that the anti-wear ability of the non-smooth concave samples was increased more than that of the smooth ones and the anti-wear ability of the non-smooth samples was evident than the smooth ones at temperature increasing. In this paper, the anti-wear mechanism of non-smooth concave samples and wear characteristics with smooth and non-smooth samples in high-temperature were analyzed.

STUDY ON THE TRIBOLOGICAL BEHAVIOR OF CUTTING TOOLS COATED WITH FILMS

2011 ◽  
Vol 25 (31) ◽  
pp. 4261-4264 ◽  
Author(s):  
MANABU YASUOKA
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Cutting Tool ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Frictional Properties ◽  
Coated Tool ◽  
Significant Difference ◽  
The Difference ◽  
Pin On Disk

A hard film coat can improve a tool's performance. In this study, the frictional properties of an uncoated tool and a coated tool with TiN were measured against that of SCM440 (42 CrMo 4) steel. The results showed there was no significant difference between the friction coefficient of the high-speed steel tool and the tool coated with TiN but the friction coefficient of uncoated tool was slightly lower than that of the steel. In the second part of the study, coats of TiN , TiC , CrN , and TiAlN were deposited on high-speed steel and the wear characteristics were determined with a pin-on-disk wear examination. The differences in the friction coefficients were attributed to the difference in the wear of the slipping material. There were large differences in the adhesion characteristics on the surface of the slipping material. The author suggest that these differences influence the characteristics of the cutting tool.

Optimisation of Processing Parameters for Direct Vacuum Sintering of a T15 High Speed Steel

1991 ◽  
Vol 34 (2) ◽  
pp. 93-100 ◽  
Author(s):  
M. Santos ◽  
M. M Oliveira ◽  
M. M Rebbeck ◽  
A. S. Wronski
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Vacuum Sintering

Preparations and Properties of Solid Lubricants Coating on High-Speed Steel Tools

2008 ◽  
Vol 392-394 ◽  
pp. 538-542
Author(s):  
Suo Xia Hou ◽  
Xiao Ming Jia ◽  
C. Wu
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Solid Lubricant ◽  
Testing Machine ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Solid Lubrication ◽  
Mixture Ratio ◽  
Solid Lubricant Coating ◽  
Cutting Test

This paper presents that the high-speed steel tools with solid lubrication material coating can cut without fluid because it has the quality of self-lubrication. With the help of M-2 friction and wearing testing machine and KYKY2800 scan electron microscope, the coating preparation technology and mixture ratio of solid lubrication material in complex coating can be optimized. The results show: phosphate treatment can increase the power of the tools’ surface adsorbing solid lubricant, and the frictional behaviour of solid lubrication coating is excellent when surface roughness of phosphate coating is Ra 2μm~Ra 4μm; molybdenum bisulfide, graphite and trioxid aluminium are mixed together and form a kind of complex coating which has better antifriction effect. The cutting test shows that the solid lubricant coating on the high-speed steel tools can be helpful in increasing the service life of the tools, decreasing the cutting resistance, and reducing the chip deformation and surface roughness of finished work.

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