Most ceramic plates, bowls, and cups have an unglazed rim around the very bottom, where the piece was in contact with the floor of the kiln. This unglazed ceramic is harder than metal and can be used just like a sharpening stone.
The good news is that with proper care and maintenance, your knives' steel edges can stay sharp for up to a year. But something as small as using the wrong cutting surface—even slicing a piece of fruit on a ceramic plate—can dull your knives on contact.
As previously stated, a whetstone is your best bet. You can get a 1000 grit king, suehiro cerax, or shapton pro whetstone without having to spend too much money on it.
Common mistakes include twisting, pressing down or pausing the stroke of knives as you pull them through the sharpener slot. This can cause oversharpening (the loss of too much metal) or result in an uneven edge.
This unglazed ceramic is harder than metal and can be used just like a sharpening stone. All you've got to do is flip the mug over and run the knife blade along it, holding it so that the edge maintains an angle of about 15 to 20 degrees.
Never cut on glass, ceramic or countertops. Those surfaces are harder than a knife's edge and will quickly dull the blade. It's what you cut on that dulls knives, not what you're cutting.
Chopping or using them to cut hard substances such as bone or frozen food can cause chips in the blade, affecting sharpness. If you do chop with your ceramic knife, it's best to keep your knife point on the cutting surface to prevent breakage. You should also avoid using your knife as a tool for prying.
SHARPENING A CERAMIC KNIFE
On average, it is recommended to sharpen it at a full angle within 30-40 degrees. Sharp angles of 20 or fewer degrees for such knives are contraindicated since the fragility of the cutting edge at this angle of sharpening becomes very large.
Knife Sharpening
Rice can be used to maintain a knife's sharpness by providing resistance that helps straighten and align the blade.
The biggest concern with ceramic knives is the chipping of the blade. The miniscule pieces breaking off of the blade shows how fragile the knives are, and demonstrates that the sharpness will decline.
In fact, Ceramic Knives are made of a very hard and tough Zirconium Dioxide Ceramic and fired at an intense heat to harden the blade. The blade is then sharpened on a grinding wheel by skilled workers and coated in a diamond-dust, until the blade is razor sharp.
Method 2: Electric Knife Sharpener
These devices simplify the sharpening process: start by selecting the setting designed for ceramic knives, if available; then slowly draw the knife through the sharpener, being careful not to apply too much pressure.
By honing the blade with a honing rod, chefs realign the edge, ensuring optimal performance. When the knife begins to feel dull and honing no longer restores its sharpness, it's time for sharpening using a whetstone or other suitable sharpening tool.
The Misono Sweden Steel Series knives are celebrated for their exceptional precision and durability. These knives are crafted from premium Swedish carbon steel and offer outstanding edge retention and sharpness.
The technique is simple and works great in a pinch. Flip over a ceramic mug, grab your knife, and run the edge of the blade against the unglazed ring on the mug's bottom at a 15- to 20-degree angle.
Ceramic knives are sharper and much lighter than steel. These knives stay sharp for longer. Ceramic knives help you with fine slicing and decorative cutting but are not built to have heavy-duty kitchen tasks. In that case, steel is a far better choice.
All you have to do is flip over the plate, run the edge of the knife along the rough edge of the plate at a 20-degree angle, repeat on the other side, and then rinse under water to flush away the tiny errant metal particles.
As for rubbing knives together, that's purely for show. It might sharpen slightly, like using the bottom of a ceramic cup, but it's not effective.