Diamond Like Carbon

Breaking news, useful data or technical highlights or vehicles that are not meant to race. You can post commercial vehicle news or developments here.
Please post topics on racing variants in "other racing categories".
User avatar
Big Tea
153
Joined: Sun Dec 24, 2017 7:57 pm

Re: Diamond Like Carbon

Post

Anyone with an interest in this may like this
and the follow on next Wednesday.

He has a slight speech impediment, but CC is available if you have trouble.

It is mostly glossing through and twice as long as it needs to be but prob still worth the 20 min
We are standing on the shoulders of Giants. So watch your feet.

TimW
TimW
14
Joined: Thu Aug 01, 2019 6:07 pm

Re: Diamond Like Carbon

Post

Cold Fussion wrote:
Sun Jun 21, 2020 5:37 pm
humble sabot wrote:
Wed Jun 10, 2020 7:48 am
It's been very common on f1 cam shafts as well.
The nicest thing about it is that it's harder than most low friction coatings, even Ti nitride. The hardness of the coating only gets you so far, the rest of the system has to be well engineered too.
Do these coatings change the material hardness significantly? I would have thought the hardness would be more a function of the base material since the nano coatings are so thin.
Depends on the scale (scale as in size) you are measuring on. Micro scale hardness will increase dramatically (e.g. scratch resistance), but large scale hardness would hardly be affected (so same as base material hardness,
hammer would leave same size dent).

I guess exactly as you thought it would be.

User avatar
Andres125sx
357
Joined: Tue Aug 13, 2013 9:15 am
Location: Madrid, Spain

Re: Diamond Like Carbon

Post

Big Tea wrote:
Sat Jun 27, 2020 7:56 pm
Anyone with an interest in this may like this
Indeed, very good video explaining everything, from composition to current problems and aplications =D> =D>

Cold Fussion
Cold Fussion
149
Joined: Sun Dec 19, 2010 3:51 am

Re: Diamond Like Carbon

Post

TimW wrote:
Sat Jun 27, 2020 8:42 pm
Cold Fussion wrote:
Sun Jun 21, 2020 5:37 pm
humble sabot wrote:
Wed Jun 10, 2020 7:48 am
It's been very common on f1 cam shafts as well.
The nicest thing about it is that it's harder than most low friction coatings, even Ti nitride. The hardness of the coating only gets you so far, the rest of the system has to be well engineered too.
Do these coatings change the material hardness significantly? I would have thought the hardness would be more a function of the base material since the nano coatings are so thin.
Depends on the scale (scale as in size) you are measuring on. Micro scale hardness will increase dramatically (e.g. scratch resistance), but large scale hardness would hardly be affected (so same as base material hardness,
hammer would leave same size dent).

I guess exactly as you thought it would be.
That makes sense, thanks.

User avatar
strad
271
Joined: Sat Jan 02, 2010 12:57 am

Re: Diamond Like Carbon

Post

Wear factor is what I would be concerned with and the slipperiness . The mentioned Teflon impregnated pistons were like wet ice on wet ice.
To achieve anything, you must be prepared to dabble on the boundary of disaster.”
Sir Stirling Moss

User avatar
humble sabot
26
Joined: Sat Feb 17, 2007 9:33 am

Re: Diamond Like Carbon

Post

Cold Fussion wrote:
Sun Jun 21, 2020 5:37 pm
Do these coatings change the material hardness significantly? I would have thought the hardness would be more a function of the base material since the nano coatings are so thin.
Surface hardness,specifically.
On high wear, but low load cases, like a cylinder wall, using a hard coating on relatively soft aluminium pistons or bores is fine, but when you have strong eccentric moments, like a camshaft or a crankshaft, the base material has to have a higher base surface hardness to support the surface treatment. If not it'll simply flake off, or be pushed into the surface.
the four immutable forces:
static balance
dynamic balance
static imbalance
dynamic imbalance