Gordon,

This is Alex. First, i would like to comment on the new forum interface, much professional and better.

Regarding my question on microhardness sprayed by HVOF. I would like to know what are the factors that affect the microhardness of a HVOF coating. If my mirco metallorgraphy has pass the photo standard, what would possibly be the factors which fails the vickers hardness test. Would increasing the density of coating help? or oxide concentration? as oxide will increase the coating hardness(Rockwell).

To increase the density or microhardness, what should be the key parameters to adjust or look into? stand-off distance? HVOF fuel or O2 gas mass flow? or turntable speed?

Pls advice.Thanks

Regards,
Alex

I am looking for photomicrographic standards for metallographic evaluation of TBC coatings, primarily for turbine components. Can anyone help me on this?

Regards,

Girish Shejale

I'm looking for companies (preferably in the US, but not required) which specialize in applying high-grade tungsten carbide *to stainless steel plungers* (2in-4.5in diameter, 10-12in in length) and who can machine the plungers after tungsten carbide application. These plungers are used in high pressure fluid pumps (up to 50,000psi). If anyone possesses excess capacity and would like to increase their business from a Fortune 500 publically-listed firm, please feel free to send me an email with a price quote (per plunger)! My needed volumes are rough, but will be close to 100/month with a consistent and timely delivery. Please form your quote to include S&H.

We rough machined the Incoloy 909 in the solution condition. Then perform aging heat treatment, final machining and FPI. However many linear indication found and those indication is about 0.010 inch to 0.020 inch. We had machined this material for many years and never encounter this problem. We do not know how this occurred.


Click to enlarge

Are those linear indications caused by machining, heat treatment process, forging process or material problems?
Has anyone suggest us a right way to solve this trouble?

Thanks in advance!

Simon

For the time being, uploading attachment files direct to the forum is disabled. A bug in the new forum software has been causing a few problems with attaching jpeg and gif image files. Please link to images and files using the "insert image and hyperlink tools (preferred method anyway). If your image or file can not be made available to the Internet, then please email the attachment and we will place it within your post.

Apologies to all members and particularly simonlee.

Dear Gordon,
We are studying the Co28Mo17Cr3Si powder by plasma spray. But the result was not good, the unmelts and oxides didn?t meet requirement. We used 9MB Gun and 728 nozzle.
Can you help us,
How to solve this problem?
How should we do?
Thanks,
Best regards,

William

Forum was closed for a major software upgrade most of today. Sorry if you were wondering why you could not connect. The upgrade took much longer to complete than expected.

hi friends


its my pleasure to join with u, even though i had been in thermal spray society for a more than 1 year , i failed to join with u.

i feel proud to be in the thermal spray society , but one thing i am not able to under stand, wat are the limiting factors for wide spread of thermal spray around the world, especially in developing countries,
eventhough it was existed since the year 1910.

wat are the thing we can do for this.

i wish u all think abt it and reply as early as possible.

Dear Members,

We are ineterested in setting up of Polymer Spraying unit for Rolls. Our primary intentions are for Coating with TEFLON/HALAR or similar products. We understand the coating can be carried out by ELCTROSTATIC SPRAY GUNS and subsequently baking in oven.

Our problem is how do we exercise the above baking procedure when the Roll dia is 1.0 m & 7.0 m in length. Will appreciate if someone can throw some light on the matter.

Thanks
Ehasan.

Dear Members,

We are having an existing Thermal Spray system from CASTODYN DS8000. We priarily use the system for Spraying CERAMIC COATINGS. We are planning to expand our capacity and are evaluating a new product ROKIDE MASTER JET from SAINT-GOBAIN.

The System uses CERAMIC STICK/RODS.

We would like to know the follwoing:-

1. Is it better then the conventional Powder Spray Torch.
2. The capital cost is higher then the conventional system But is it economical on maintenance & running cost.

We will appreciate feed backs on the matter to make a final decision.

Thanks
ehasa