Structured abasives.

[FredyCro]

Advances in fabrication of ceramic corundum abrasives based on sol–gel process

Corundum abrasives with good chemical stability can be fabricated into various free abrasives and bonded abrasive tools that are widely used in the pr…

www.sciencedirect.com

I found this. It looks promising.

Edit: I really need to get some sleep. But from the reading I just did, it isn't quite as simple as sintering normal aluminum oxide grain to form ceramic aluminum oxide. Sintering is a part of it.

It's also saying that (much like steel) having an extremely fine microcrystaline structure increases the fracture toughness of the abrasive, and also leads to more uniformity when breaking.

I have more reading to do in that article though.

I would be interested in an executive summary

 

[Super_Alloy_Alan]

I should probably state that if one abrasive works for one person it's not necessarily going to work for another person. We all have different grinding styles (force) which is technically going to effect the performance. I'm starting to wonder why this is being discussed if it's going to literally be personal preference. Just saying.

 

[Skiller1nc]

I should probably state that if one abrasive works for one person it's not necessarily going to work for another person. We all have different grinding styles (force) which is technically going to effect the performance. I'm starting to wonder why this is being discussed if it's going to literally be personal preference. Just saying.

are you a bot? all your comments are either recycled things others have said/know or make no sense

 

[FredyCro]

I should probably state that if one abrasive works for one person it's not necessarily going to work for another person. We all have different grinding styles (force) which is technically going to effect the performance. I'm starting to wonder why this is being discussed if it's going to literally be personal preference. Just saying.

I am wondering why you are commenting everywhere without having a constructive or positive feedback on anything. Just saying.

If you stay around long enough, you will soon learn there are ways to express your opinion without being cheeky, sarcastic or just provoking in order to have fun. Even if we are just engaging in WWW, we respect each other even when our opinions defer. Especially since there is really knowledgeable people who take up their free time to share their knowledge and experience with us who have less of it.

 

[AVigil]

I'm starting to wonder why this is being discussed if it's going to literally be personal preference. Just saying.

First off this is a discussion forum.
Second personal experience often can help people decide what to use and try for themselves.

How about you post up some pictures of your work so we can see where you are on the spectrum of knifemaking.

 

[FredyCro]

First off this is a discussion forum.
Second personal experience often can help people decide what to use and try for themselves.

How about you post up some pictures of your work so we can see where you are on the spectrum of knifemaking.

You're wasting your energy (as was I), he was already recognized as a returning troll and blocked on the Apex thread.

 

[fitzo]

-----delete----

 

[Cole2525]

Advances in fabrication of ceramic corundum abrasives based on sol–gel process

Corundum abrasives with good chemical stability can be fabricated into various free abrasives and bonded abrasive tools that are widely used in the pr…

www.sciencedirect.com

I found this. It looks promising.

Edit: I really need to get some sleep. But from the reading I just did, it isn't quite as simple as sintering normal aluminum oxide grain to form ceramic aluminum oxide. Sintering is a part of it.

It's also saying that (much like steel) having an extremely fine microcrystaline structure increases the fracture toughness of the abrasive, and also leads to more uniformity when breaking.

I have more reading to do in that article though.

Thank you so much for sharing this absolutely brilliant paper. It looks like it answers every question I had and many more.

 

[Blankblank]

Thank you so much for sharing this absolutely brilliant paper. It looks like it answers every question I had and many more.

No problem. I still have it opened in another tab. I need to get back to reading. I might post a summary like FredyCro asked about when I'm done.

Also. Yeah that one guy did seem like he was just trying to be antagonistic from the first post he left in this thread.

I'm glad I'm not the only person here who likes to learn more about something that matters to them, and get the opinions and experiences of others on topics.

 

[Blankblank]

Ok here is the summary I have of the paper. It's as simplified as I can make it, and I will preface this by saying I'm in no means an expert.

They use something called the sol-gel (the sol gel is what the sg means on norton blaze abrasives) method to form the al203 abrasive before calcination, and sintering. During this they found doing a process called seeding, which is adding an additive to the sol helped propegate the formation of al2o3 grains. (I think of it like putting salt into a pot of hot water, then suddenly it starts to boil). Doing this increases the density of the abrasive.

There are other additives that can be put in before the calcination, and sintering that forms a silicon substance at the grain boundries that helps with the density of the abrasive, and also strengthens the bonds.

It goes into the topic of grain growth during sintering. This part really reminded me of steel. Basically much like steel with larger grains, you get poorer toughness. However they were getting higher density during the final stages of the sintering process, but because of the dissolution of grain boundries there was grain growth. So a method that involves doing the sintering in 2 steps allows for high density, and a small grain size.

Also it go into the production of different shaped ceramic abrasives. I wont get into the making of them. The results they found of using abrasives that were uniform in size rather than the traditional varying shaped grains, was a longer lasting abrasive. And that it actually reduces heat caused by grinding because of how it removed the material.

I hope that was readable.

 

[FredyCro]

Ok here is the summary I have of the paper. It's as simplified as I can make it, and I will preface this by saying I'm in no means an expert.

They use something called the sol-gel (the sol gel is what the sg means on norton blaze abrasives) method to form the al203 abrasive before calcination, and sintering. During this they found doing a process called seeding, which is adding an additive to the sol helped propegate the formation of al2o3 grains. (I think of it like putting salt into a pot of hot water, then suddenly it starts to boil). Doing this increases the density of the abrasive.

There are other additives that can be put in before the calcination, and sintering that forms a silicon substance at the grain boundries that helps with the density of the abrasive, and also strengthens the bonds.

It goes into the topic of grain growth during sintering. This part really reminded me of steel. Basically much like steel with larger grains, you get poorer toughness. However they were getting higher density during the final stages of the sintering process, but because of the dissolution of grain boundries there was grain growth. So a method that involves doing the sintering in 2 steps allows for high density, and a small grain size.

Also it go into the production of different shaped ceramic abrasives. I wont get into the making of them. The results they found of using abrasives that were uniform in size rather than the traditional varying shaped grains, was a longer lasting abrasive. And that it actually reduces heat caused by grinding because of how it removed the material.

I hope that was readable.

That's really interesting, thanks for the summary. Anything about how do they go about forming the “structure“ in the structured abrasives? Some kind of dyes and/or preforms?

 

[Blankblank]

That's really interesting, thanks for the summary. Anything about how do they go about forming the “structure“ in the structured abrasives? Some kind of dyes and/or preforms?

Yes actually I'll reread and edit this with what it says.

Edit: so it says there are 3 methods they mainly use for forming the structured abrasives. In all 3 the shaping process is done before calcination, and sintering.

The 1st is the micromold method. It's the oldest, and most expensive. It involves putting then sol gel into a polymer mold to shape the abrasive.

Then is a screen printing method. Where the sol gel is put into a screen that has the shapes that are going to be made, then mechanically removed from it.

The final is the laser cutting method.