FAQ
超硬が割れる原因は何ですか？
超硬材料は、金属材料に比べて熱膨張率が違います。 このため、焼きばめ／冷しばめされた製品は、
使用温度が設計値と事なり著しく高い（低い）場合、割れが発生する事があります。
また、硬度が高い超硬合金を使用する際には、大きい衝撃がかかると割れなどの問題が発生する場合もあるので破壊靭性値にも注意して選定していく必要があります。
Q&A in the same category in this question
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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. -
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。
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