787b cermet coating
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Joined: Nov 2002
Posts: 26
From: Salt Lake
I have been looking online for quite a while trying to figure out differences between coatings and learn how they work and such. I can't seem to find a whole lot of technical info on the coating mazda used in the r26b. does anyone have a link, or know if it is just a carbide ceramic or does it have more to it? any help is greatly appreciated.
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Joined: Dec 2004
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From: Kitchener Ont Canada
Senior Member
Joined: Dec 2004
Posts: 219
From: Kitchener Ont Canada
Thread Starter
Junior Member
Joined: Nov 2002
Posts: 26
From: Salt Lake
Originally Posted by R.P.M.' post='808751' date='Mar 19 2006, 11:13 PM
I know that they sell it but that's not what I'm looking for. I want to know the make up of it, whether it is just a ceramic carbide mixture or a ceramic alluminum mixture or any thing else, I highly doubt he is going to tell me over the phone the mixture of his product, that wouldn't be a very smart business move.
Senior Member
Joined: Apr 2005
Posts: 148
From: GA
Real world solutions, aka, rotaryaviation.com has a neat rotary history section.
http://www.rotaryaviation.com/rotaryhistory.htm
It has some info about probably every rotary engine made, including the R26B. They say it was coated with a hot-sprayed chrome-carbide cermet. After the race Mazda dismantled the engine in front of the press. It was found that all engine clearances were within 1/3 to 1/2 the upper wear limits.
The JHB coating sounds very similar, at least when I spoke with Marc a year ago. He said the coating definitely had carbide in it.
Although my engine has yet to be run, I can still vouch for how tuff the coating is. 60-grit sanding rolls barely touch it! Take a look at the set of exhaust sleeves I polished. When they recoated the housing the diffusers got some in them. The coating is so hard, it made the stainless steel of the sleeve seem soft. After getting the sleeves polished you can se a faint difference in the color of the cermet compared to the stainless. The stainless is more of a white metal; whereas, the cermet has a very very light coper-ish color to it. I'd need a high-res camera for it to show up in the pictures though.
Keep digging for more info and good luck!
http://www.rotaryaviation.com/rotaryhistory.htm
It has some info about probably every rotary engine made, including the R26B. They say it was coated with a hot-sprayed chrome-carbide cermet. After the race Mazda dismantled the engine in front of the press. It was found that all engine clearances were within 1/3 to 1/2 the upper wear limits.
The JHB coating sounds very similar, at least when I spoke with Marc a year ago. He said the coating definitely had carbide in it.
Although my engine has yet to be run, I can still vouch for how tuff the coating is. 60-grit sanding rolls barely touch it! Take a look at the set of exhaust sleeves I polished. When they recoated the housing the diffusers got some in them. The coating is so hard, it made the stainless steel of the sleeve seem soft. After getting the sleeves polished you can se a faint difference in the color of the cermet compared to the stainless. The stainless is more of a white metal; whereas, the cermet has a very very light coper-ish color to it. I'd need a high-res camera for it to show up in the pictures though.
Keep digging for more info and good luck!
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Joined: Nov 2002
Posts: 26
From: Salt Lake
Originally Posted by Newguy707' post='809199' date='Mar 22 2006, 08:11 AM
Real world solutions, aka, rotaryaviation.com has a neat rotary history section.
http://www.rotaryaviation.com/rotaryhistory.htm
It has some info about probably every rotary engine made, including the R26B. They say it was coated with a hot-sprayed chrome-carbide cermet. After the race Mazda dismantled the engine in front of the press. It was found that all engine clearances were within 1/3 to 1/2 the upper wear limits.
The JHB coating sounds very similar, at least when I spoke with Marc a year ago. He said the coating definitely had carbide in it.
Although my engine has yet to be run, I can still vouch for how tuff the coating is. 60-grit sanding rolls barely touch it! Take a look at the set of exhaust sleeves I polished. When they recoated the housing the diffusers got some in them. The coating is so hard, it made the stainless steel of the sleeve seem soft. After getting the sleeves polished you can se a faint difference in the color of the cermet compared to the stainless. The stainless is more of a white metal; whereas, the cermet has a very very light coper-ish color to it. I'd need a high-res camera for it to show up in the pictures though.
Keep digging for more info and good luck!
Thanks that helps a bit. If anyone has anymore specific info it would be great.
Thread Starter
Junior Member
Joined: Nov 2002
Posts: 26
From: Salt Lake
Originally Posted by Newguy707' post='809199' date='Mar 22 2006, 08:11 AM
Real world solutions, aka, rotaryaviation.com has a neat rotary history section.
http://www.rotaryaviation.com/rotaryhistory.htm
It has some info about probably every rotary engine made, including the R26B. They say it was coated with a hot-sprayed chrome-carbide cermet. After the race Mazda dismantled the engine in front of the press. It was found that all engine clearances were within 1/3 to 1/2 the upper wear limits.
The JHB coating sounds very similar, at least when I spoke with Marc a year ago. He said the coating definitely had carbide in it.
Although my engine has yet to be run, I can still vouch for how tuff the coating is. 60-grit sanding rolls barely touch it! Take a look at the set of exhaust sleeves I polished. When they recoated the housing the diffusers got some in them. The coating is so hard, it made the stainless steel of the sleeve seem soft. After getting the sleeves polished you can se a faint difference in the color of the cermet compared to the stainless. The stainless is more of a white metal; whereas, the cermet has a very very light coper-ish color to it. I'd need a high-res camera for it to show up in the pictures though.
Keep digging for more info and good luck!
Thanks that helps a bit. If anyone has anymore specific info it would be great.
Senior Member
Joined: May 2002
Posts: 22,465
From: California
Originally Posted by Newguy707' post='809199' date='Mar 22 2006, 07:11 AM
Real world solutions, aka, rotaryaviation.com has a neat rotary history section.
http://www.rotaryaviation.com/rotaryhistory.htm
It has some info about probably every rotary engine made, including the R26B. They say it was coated with a hot-sprayed chrome-carbide cermet. After the race Mazda dismantled the engine in front of the press. It was found that all engine clearances were within 1/3 to 1/2 the upper wear limits.
The JHB coating sounds very similar, at least when I spoke with Marc a year ago. He said the coating definitely had carbide in it.
Although my engine has yet to be run, I can still vouch for how tuff the coating is. 60-grit sanding rolls barely touch it! Take a look at the set of exhaust sleeves I polished. When they recoated the housing the diffusers got some in them. The coating is so hard, it made the stainless steel of the sleeve seem soft. After getting the sleeves polished you can se a faint difference in the color of the cermet compared to the stainless. The stainless is more of a white metal; whereas, the cermet has a very very light coper-ish color to it. I'd need a high-res camera for it to show up in the pictures though.
Keep digging for more info and good luck!
we talked to koby himself, he said the apex seals showed .0004mm of wear, which is less than the tolerance of the measuring tool. the 787 engine could have run another 24hours
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