FAQ
Why does the amount of Co and WC particle size affect the thickness of the heat affected layer?
It is thought that when Co is in large quantities the fusing point is lowered, which increases the amount that melts and thickening the damaged layer.
It is also thought that when WC particle size is small, the material becomes easier to melt due to the volume effect, which thickens the damaged layer.
Q&A in the same category in this question
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What is the relationship between hardness and strength?
Hardness affects resistance to abrasion, and harder the material the more resistant it is to abrasion.
However, amount of abrasion is not only determined by hardness, but could be affected by adhesions caused by workpieces of certain materials.
Thickness also affects the life of material, and so the environment and manufacturing process must be taken into consideration when selecting cemented carbide grade.
There are many factors related to strength, such as transverse rupture strength, impact strength, fracture toughness value and others, therefore material selection must be made in consideration of these factors. -
超硬合金とセラミックの違いは何ですか？
セラミックスの硬度は地球上で最も硬い鉱物であるダイヤモンドに迫る硬さを持ちます。
ダイヤモンドの硬度を10とすると、セラミックスは硬度9以上を示し、タングステンなどの超硬金属よりも高い硬度を持ちます。
また、成分の違いによって超硬合金の場合は重量が重くなるという特徴もあります。
ただし超硬合金はタングステンカーバイド（WC）の粒子や、結合材の配合量、微量添加物によって、さまざまな特徴をもつ超硬合金をつくりだすことができますので、多くの材種からベストマッチの材種選定が可能です。 -
超硬合金の弱点は何ですか？
一般的な鉄合金と比較すると、靱性（ねばり強さ）が低く、刃先が欠けてしまう・剥離するといったような現象が起こることがあります。
また、比重が鉄の約2倍ありますので、重量が重くなることがデメリットとなる場合もあります。
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