Any advantages to a titanum blade?

Titanium except by Sam at Mad Science Forge is not really suitable for using knives. It's actually very easy to sharpen because it's not very hard and even with optimized heat treat for cutlery, it's not very hardenable. Even Sam only gets his knives and swords to the mid- to high-50s on the Rockwell C scale, if I recall correctly.

However, another method of getting a useable titanium knife is to make a chisel-ground knife with the flat bevel edge carbided. That provides an extremely toothy edge that is excellent for cutting fibrous material like rope or meat. You can then sharpen it by sharpening the titanium side to expose fresh carbides on the flat bevel.

Those knives are still not really for heavy use, though.

I would consider a titanium knife for saltwater diving, the stainless steel dive knives don't hold a edge well. The right titanium alloy may do just as well or better.

I have seen several knives as advertised "Titanium coated blades." Haven't seen any with all Ti blades though so it doesn't sound like a good steel for knives.

I have several of these I used to use for scuba. They work well but I didn't use them enough to need sharpening.





https://www.scuba-aquatec.com/en/product/Scuba-Titanium-Knife/kn-200K.html

I have two titanium knives. Both Newt Livesay Woo variations.

I carried them around my neck in uniform. A rather hot and damp climate for several months of the year in Texas.

They would “cut”. But, they were extremely lightweight little stickers that were easy to carry.

The one with sharper grind lines is actually fairly sharp.

There was once a bit of a fad for cobalt knife blades, I find at least one source.
What of them?

I use a titanium one at work. It's okay, doesn't hold a edge well. I'm cutting thru cardboard, plastic and using it to pry up HD staples. I have to resharpen it and once a week. I only use a cheap ceramic sharpener, took about a month for the edge to wear in with the sharpener but now it works just fine.