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  • Users: will123
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  1. will123

    Titanium-6Al-4V - Elevated temperature surface protection

    My company is looking at using titanium-6Al-4V for a high temperature application. I appreciate there are better, alternative titanium alloys available, but this is the best available in the neessary timescales. Obviously the reduction in mechanical properties is being designed for. But, the...
  2. will123

    Expanding polymeric beads/ pellets

    Is anyone able to point me in the direction of a company who can supply beads or pellets of a polymer material that can undergo preferably an irreversible expansion or swelling when exposed to elevated temperatures (above 100°C)- basically I require a more controlled version of popcorn!!! I can...
  3. will123

    Book on Lubrication of gears and gearboxes

    Can anyone here recommend a good book to purchase that goes into details on the lubrication of gearboxs. Typical information I would like include the following: - Functions/ requirements of an oil. The different additives of an oil and reasons for their uses. How does changing the oil...
  4. will123

    Peroxide Etching of titanium for bonding

    We are currently experiencing some problems with bonding titanium 6Al-4V to epoxy resins- the geometry of the joint in question leaves a lack of access for our standard titanium preparation method; abrasion and then exposure to plasma. Therefore we would like to run some bonding trials after the...
  5. will123

    Supply of Al-Li in UK

    I wonder if any of you can advise of companies which supply aluminium lithium alloys in the UK Thank you in advance
  6. will123

    13-8PH - Strength in Cond. A

    We have a part manufactured from 13-8PH, which has been bonded into an assembly. Unfortunately it has since been discovered the part has missed the heat treatment step to age it. I appreciate all the literature states the material should not be used in the solution treated condition, but could...
  7. will123

    Test House for Wear and Friction Testings

    Can anyone recommend a test house in the UK, which is able to carry out wear testing and measurement of friction coefficients? Thank you in advanced for your assistance.
  8. will123

    Source in the UK for 304N or 304HN

    For a particular application we require the physical properties of an austenitic stainless (density, stiffness, expansion coefficient). The part is of size approximately 800mm by 500mm by 32mm and we are making about 24 units. AISI 304 is ideal apart from one thing, strength, however all other...
  9. will123

    High Expansion Coefficient Steels

    I am in the UK and would like to find a source of steel with a expansion coefficient in the region of 20?m/m.°C, preferably in plate form (although larger section bar, which could be forged flat could be acceptable).At the moment we are using austenitic stainless, but ideally need to increase...
  10. will123

    Safe Endothermic Reaction

    I have a need to temporarily keep a liquid cool where there is no available external power supply. For this particular application making use of an endothermic reaction would be a good solution. But I would like for it to be safe. A couple of possible reactions is to dissolve Potassium or...
  11. will123

    Assessment of notch sensitivity

    Is it possible to determine (at least to get a reasonable estimate)the relative notch sensitivity of different materials from their values of the standard mechanical properties, such as UTS, yield strength, elongation etc? Or is the only way to get this information by conducting notched tensile...
  12. will123

    Crack in 303 Stainless Steel

    I am examining the failure of a machined part manufactured from 303 Stainless Steel, and not exactly sure of the cause. Your thoughts would be appreciated. The key points are:- The part is a banjo type connector from a brake system on a racing car. The design has been in use for a number of...
  13. will123

    Fatigue Testing - starting load

    I am going to start carrying out some fatigue testing on a number of ferrous and non-ferrous alloys to produce S/N curves. Test parameters: tension-compression, fully reversed, Kt=1. Could you please give me some advice on how to decide on which loads I should consider testing at considered to...
  14. will123

    Biosteel fibres

    A couple of years ago a Canadian company called Nexia Biotechnologies published details of the production of a fibre called 'Biosteel'. This was effectively spider's silk, that was spun from milk from goats, which were genetically modified to be part (if I recall correctly, 1 in 300)spider. I...
  15. will123

    Information on Chemi-Black!!

    I am interested in finding out a couple of details about the chemi-blacking of ferrous alloys. I have carried out a Yahoo search, but cannot find a great deal. Firstly, is it a type of phosphrous based conversion coating. Secondly, can anyone tell me how its friction co-efficient compares to...
  16. will123

    Etch for Austenite in Maraging Steels

    Your assistance on a particular problem would be appreciated and I thank you in advanced. I am examining a cracked component manufactured from Maraging Steel. The manufacturing process is simply finish machine then solution treatment and age. Before, you ask why it was solution treated because...
  17. will123

    Recovery of Carburised parts

    Good afternoon, Your assistance in a heat-treatment problem would be appreciated. I have some parts, the basic shape of which are 2.5mm thick by 125mm diameter discs. The material is en36c. They have been carburised and unfortunately have distorted beyond our grinding allowance. Originally...
  18. will123

    Grinding Cracks?

    I have a component made from a case hardening steel called Hi-Tuf. The part contains a numbner of fine cracks on a flat ground surface (the surface had subsequently been shot peened). They look like grinding cracks. However on sectioning the part there is no sign of overheating or surface...
  19. will123

    Coefficient of Friction of Ti-Ti

    Does anyone have a value for the co-efficient of friction for titanium on titanium please.
  20. will123

    Composition of BS materials

    Please consider a titanium alloy to BS TA 56. This calls for a composition of: Al 5.5 - 6.75% V 3.5 - 4.5% Fe 0.30% max O+N 0.25% max H 0.0125% max Ti remainer However the certificate sent with the material we order, says it is to TA 56, but has a typical composite of: - Al 6.2% V 4.1% O 0.177%...

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