Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain the Properties of Poly Tetra Fluoro Ethylene?
PTFE is a linear chain polymer of great molecular strength, known for its chemical inertness and low coefficient of friction. PTFE is not oxidised easily, it is resistant to all common solvents and remains stable at extremes of atmospheric temperatures. It was earlier thought that lowest coefficient of friction could be obtained with PTFE sliding against PTFE. But on the basis of tests conducted on several frictional interfaces, it has been conclusively proved that the frictional coefficient of PTFE sliding against grounded stainless steel surface is lower than PTFE on PTFE. However PTFE has poor creep properties i.e. it exhibits permanent compression under loads.
It also has poor bonding properties, and therefore, always used in thin sheets (upto 3 mm) recessed in a steel plate with half the thickness of PTFE embedded. Addition of certain fillers such as glass fibre, graphite or bronze to PTFE increases the wear resistance and creep properties but it also increases the frictional resistance. Fillers of molybdenum sulphide or silica though improves wear and creep properties without appreciable increase in friction. In bridge bearings, pure PTFE is therefore rarely used. Although, friction between steel and PTFE is the minimum, yet it is highly susceptible to intrusion of dust. Elaborate arrangements are, therefore, must to prevent entry of dust particles on the sliding surface. Silicon grease is generally used as a lubricant for PTFE surfaces. Dust seals are also recommended around PTFE bearings to prevent the ingress of dust.
about rmc and what are the safety measures taken and which licences are required
the python program
What is civil engineering?
Compute the stresses at top and bottom fibers in a simply supported pre-stressed concrete beam with a rectangular cross section, 250 mm wide and 450 mm deep, as shown in Figure, at
Question It should be necessary that raking piles of a bridge abutment be placed under an embankment ? Answer For a bridge abutment to be supported on raking piles with div
floors
Measurement quantity of excavation, concrete, formwork as my assignment brief.
applications of vectors
Q. Axial flow pumps for large flows and low heads? It is well known that axial flow pumps are the most suitable for providing large flows and low heads. Reason behind this is c
What is the Design Mix concrete Determination of the proportions of cement, aggregates and water to achieve the required strengths in concrete is made by designing the con
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd