Oh, boy!! Finally a chance to ask my son, Neanderthal Jr.( who just got his MS in Materials Engineering from New Mexico Tech) a question to justify his college expenses!!
"To answer this, we first have to take a look at Dave’s chisels-- and he sums it up perfectly. There is a tradeoff between brittleness and hardness that one must be very careful to walk the line of. The higher quality chisels are likely tempered, which recovers some of that ductility, but the high hardness still allows them to have the edge of the Gods-- this is why tempering and cryogenic treatment are common, and mostly necessary, for high-carbon steels. It can also be seen in ceramic kitchen knives-- sharper than anything else, but drop one, and it’s done.
Zirconium nitride coatings try to cheese this trade-off, by having a hard outer shell over a softer steel core-- almost like an egg shell. Dave also called it on the nitride coatings being used more for lubrication purposes-- it can make a surface smoother than a baby’s ass, as well as give it that nice golden color. Also, zirconium nitride is the vogue in corrosion resistance, which is actually where a surprising amount of sharpness is lost in the blades-- I can’t remember the specifics, but shaving razors actually get dull due to corrosion more than actually cutting hair-- which is why the leather strap method works so well.
So, in short, zirconium nitride is magnificent if you live in areas with high humidity, or if you need that fluid cut. However, just for general purpose, I would honestly say go with the standard steel blades-- much more forgiving, and a Hell of a lot easier to work with if you need to hone them."
OK— He actually took time away from his stupid video games to write this screed… not bad, but will it eventually get me a nice nursing home at the beach?? My own recent experience— check Woody Joe Himeji Castle on Amazon for my short review— is that a lot of these “advances” are a sales tool, and don’t make much difference in normal hobby work. #11 blades cost about $.30 cents each tops, so when I look at my used blade pile and see each blade as a 25 cent piece, I get a little nervous…
Which brings us to the sharpening issue. Sharpening tools is a marvelous skill, and quickly can become a fetish. It’s a fairly substantial learning curve, but sharpening junkies know no better fun than putting an edge on anything that doesn’t move. While in Japan years ago, I got hooked on water stones, and they can actually improve Xacto edges, with practice. My dad was an old Arkansas stone freak, and I still have a bunch of his old, oily, worn down stones. It comes down to " how much fun am I having", and “Is it worth it or not”.
Does any of this make sense??
john & George