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How can ceramic be both a non stick material and really good friction material?

Ceramic coating a car makes water bead right off, but the best brake pads and clutches are also ceramic (aside from carbon ceramic and carbon carbon)

Answered: basically ceramic is a wide range of materials with vastly different properties

dual_sport_dork ,
@dual_sport_dork@lemmy.world avatar

Ceramics are a broad class of materials with a wide spectrum of properties. There is no one singular material called “ceramic.” Ceramic materials can be made smooth and slippery or textured and grippy, and everywhere in between.

xmunk ,

Included in that range are both terracotta and bone China which are radically different materials.

nandeEbisu ,

Quoting Wikipedia in reference to the variance in ceramics for the degree of crystallinity and number of electrons in their iconic and covalent bonds:

With such a large range of possible options for the composition/structure of a ceramic (nearly all of the elements, nearly all types of bonding, and all levels of crystallinity), the breadth of the subject is vast, and identifiable attributes (hardness, toughness, electrical conductivity) are difficult to specify for the group as a whole

EveryMuffinIsNowEncrypted ,
@EveryMuffinIsNowEncrypted@lemmy.blahaj.zone avatar

Well, the bottoms of cleets are friction-inducing surfaces, but unless you pour a LOT of soda onto them, they ain’t gonna be sticky.

It’s as simple as that.

xmunk ,

Because ceramic is an extremely vague term - as a parallel you can look at carbon which can be crumbly and a good fuel, one of the hardest materials on earth or a variety of other forms.

strawberry OP ,

guess so, i thought ceramic would just be one thing but yeah that makes sense

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