Hello,
I have question about two fused coatings NiCrBSi and NiCrBSi+WC. The fused part is roll which transport various shapes steel slabs , stick and ... . There are constant impact of them to coating, temperature of them 800-1100C, part become heated to 200C, steam of water at the same time. Which coating will be better and why I need answer if it is possible WHY?
Best regards
Arturas

Hi all,

Anyone here having any idea about RR?s coating application?

Anyway, I am spraying with METCO 73F-NS-2 to MSRR9507/1, which is WC-16Co powder.

I found that there is micro cracking among coating; I suspect that it is because deposit efficiency is 0.00075? per pass. May be too higher.

1, anyone can tell me the proper surface speed and traverse speed for this coating?
2, how to reduce micro cracking if you are facing this problem?
3, how to adjust to reduce deposit efficiency?

If any one is interested we have a special on 726KG(1600 pounds) Centrifugal Casting Powder with a chemistry:
W:44.075%
Ni:42.50
C:2.915
Si:2.30
Cr:3.45
Co:2.85
Fe:0.175
B:1.63
Ti:0.05
P:0.005
Ta:0.05
Mesh Size:
+35: 2.05%
+50: 7.11
+80: 12.225
+100: 9.87
+140: 16.345
+170: 10.75
+200: 18.54
+230: 11.86
+270: 6.15
+325: 3.50
-325: 1.60

Contact me(Russ) at russb@surfaceengineering.com

We are new to this forum. We hope to help you in your needs.

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Surface Engineering & Alloy Co.

Hi all,

My question is about the colour of TBC. If I understand correctly, this has to do with (reaction) stoichiometry.

When Zr0(2) is formed (using plasma spraying for example), not all Zr reacts with oxygen, resulting in non-stoichiometric solid, for example ZrO(1,95), a softgray coloured TBC. When heating the TBC in an oven (for about an hour at 600 degrees Celsius), the rest of the Zr atoms will react with oxygen forming stoichiometric ZrO(2), a white coloured TBC.

When heating the TBC longer and/or at higher temperatures the TBC will become yellow-white coloured. This is strange to me as I thought it's not possible to form non-stoichiometric ZrO(2,05), as all Zr is bonded...

Can anybody explain this to me? I probably didn't describe my question really clear, but I assume you will understand what I mean.

Thanks in advance.

Best regards,

Rogier

I would like to convert FMR units in SCFH.
Metco DJ console flow meters show:

Air: SCFH=15.80x%
O2: SCFH=14.44x%

Are these equations OK ?

And for Hydrogen ??

Thank you

Hi all

please I'm looking for good service organisation for Rockwell mechanical hardness tester.
Preferably in the UK. We use one organisation for calibration, but it seems that they don't know to repair our tester.

Many Thanks.

harryP

The Surface Engineering Forum is one year old today (27 Jun 2007).

I would like to thank SEF members for their participation over the last year, with an extra thank you for those that posted useful information and made the effort to answer some of the questions.

hi, I would like to know aside increasing the power of the laser system, are there any other methods to increase the processing efficiency of laser transformation hardening.

Hi forum,

I need help. We have troubles with HVOF spraying on nitriding surfaces. We use stainless steel FeCrNiBSiC. If coating contact with nitriding surface, his crashed. What I can to do?
May be anybody recommend other material with microhardness around 800HV for repair and build-up.

Thank you.