Thứ Tư, 2 tháng 12, 2015

Ceramic knives are made of a compound of zirconium, a substance found mainly in Australia, combined with other elements such as magnesium and calcium to increase its hardness. The knives are made by a process of heat treatments and diamond sharpening. This means the blade of a ceramic knife is significantly harder than a stainless steel knife (ceramic around 8.5 Moh, stainless steel between 5 and 5.5 Moh), and retains its sharpness, if used as manufacturers recommend, for a good deal longer than a comparable stainless steel knife. Kyocera, for example, suggest that their ceramic blades will last 10 times longer than carbon steel blades. It is possible to buy a sharpener specifically designed for ceramic knives. Ceramic knives will not rust or corrode, are not attracted by magnets, and as they are chemically inert, they won’t react with foods which are strongly acidic or alkaline.

The downside of ceramic knives is that they are more brittle in some circumstances than stainless steel knives; they are more prone to shatter if dropped when using. Ideally, ceramic knives need to be stored more carefully than other cutlery; it is wise to protect them with a knife guard or to store them in a knife block, to prevent other items from striking and shattering them. They tend to break if used to cut bone or frozen foods, and do not work well in cutting situations where one is prizing sections apart. It’s also inadvisable to use them for non-food related work – they have been known to shatter when used as a makeshift screwdriver! Ceramic knives work better if used on a soft cutting board, such as rubber, wood or soft plastic – they are more prone to shatter on marble or hard plastic. One should also be aware that as the blade of a ceramic knife is sharper than that of a stainless steel knife, it is far easier to cut oneself when using a ceramic knife.

Amazon sells a 3 piece Oliver & Kline best ceramic knife set for $23.99
This set contains:
·         1 x 6” chef’s knife
·         1 x 5” utility/slicing knife
·         1 x 4” fruit/paring knife
·         Magnetic box to contain the knives

A sharpener for these knives is available at $5.75.

«««««This knife set scored 4.8 stars out of 5 over 371 reviews.

Ceramic knives in summary

Key: JGood
! ! Be aware of risk

Sharper than steel compound knives
Sharpness retained longer than steel compound knives
Knives will not rust or corrode
Knives are not attracted by magnets
Knives will not react with acid or alkali
Knives work best on a softer cutting board, such as soft plastic, bamboo or rubber
More brittle than steel compound knives, so prone to shatter when dropped
Knives need to be stored where they will not be knocked
Knives are unsuitable for cutting bone or frozen items
Knives are unsuitable for prizing sections of food apart
Knives cannot be used for tasks other than food preparation
Caution is needed when using knives as it is easy to cut oneself because they are so sharp
! !