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 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. -
超硬とハイスの違いは何ですか？
超硬合金は硬度が高く、耐熱性や強度に優れた合金です。 一方のハイス鋼は超硬合金と比べると強度や耐熱性は劣るものの、耐衝撃性は上回ります。 両者は原材料・製法が異なるため、コストの面でも大きな差があります。 使用する場面や導入後の買い替えのタイミングなどを考慮して、適した方を選びましょう。
詳しくはこちら：超硬合金（超硬質合金）とハイス鋼（高速度鋼）の違いは？利用に適した場面も紹介！
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