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Hafnium carbide (HfC) is a chemical compound of hafnium and carbon. With a melting point of about 3900 °C it is one of the most refractory binary compounds known. However, it has a low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C.Hafnium carbide is usually carbon deficient and therefore its composition is often expressed as HfCx (x = 0.5 to 1.0). It has a cubic (rock-salt) crystal structure at any value of x.Hafnium carbide powder is obtained by the reduction of hafnium(IV) oxide with carbon at 1800 to 2000 °C. A long processing time is required to remove all oxygen. Alternatively, high-purity HfC coatings can be obtained by chemical vapor deposition from a gas mixture of methane, hydrogen, and vaporized hafnium(IV) chloride. Because of the technical complexity and high cost of the synthesis, HfC has a very limited use, despite its favorable properties such as high hardness (>9 Mohs) and melting point.The magnetic properties of HfCx change from paramagnetic for x ≤ 0.8 to diamagnetic at larger x. An inverse behavior (dia-paramagnetic transition with increasing x) is observed for TaCx, despite its having the same crystal structure as HfCx.
***SPF***
I have a very low round count (less than 100 rounds) 10.5” AR upper. This was purchased new from PSA and is one of their premium pistol uppers.
Comes with an FN cold hammer forged 10.5” barrel, Geissele Mk14 9” Mlok rail, Geissele Super Gas Block that is pinned to the barrel, and a...
Less than 100 rounds fired. I was going to do a pin&weld but got cold feet. FSB pinning done by Ranier Arms. Does not come with flash hider seen in photos (can include for extra $). I'd prefer local pickup. Txt is good for that : 315 five seven two 2542