FAQ
What are the effects of corrosion?
We checked a cemented carbide made 20 years ago, and verified 20 microns worth of corrosion.
Only the surface was corroded, so we were able to remove it by reprocessing it.
However, there are cases where some corrosion cannot be removed due to working environments, so we recommend regrinding if the corrosion is 0.1mm or greater. If storing after regrinding, ensure that all processing liquids have been removed and dried. Apply the carbide with rust preventive oil or paper, or cover in alumina powder.
Q&A in the same category in this question
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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。 -
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. -
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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