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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.
ETA 3.0: Reduced again, how is this still here?
ETA: Reduced price again!
ETA: This was sold but the buyer flaked. So I reduced the price and relisted it! Probably as low as I'll go. I'll SBR it if it doesn't sell at this price.
I bought this new. I had it on my wish list but kept...
Bought this, put in a BCG/CH [not included] and mounted it to a pistol lower for safe storage. New, never fired. Upper shown is the one that you will receive! Comes with original box from PSA. Electronic payments preferred but snail mail works too. Thanks for looking!
I bought this new. I had it on my wish list but kept missing it whenever it came into stock. After about 1 year I snagged this one for $629 direct from PSA. I briefly installed a BCG [not included]and put it on a braced lower. I never even had time to buy an optic and FJB/AFT came along with...
10.3 Strike Fighter Barrel. 223 wylde, 1:8, CHF, 416RS Nitrided. (Contract overrun purchased and branded by Strike Industries, USA made!) Less than 100rnds.
Very accurate for a "10.5" style barrel.
Spikes branded Superlative Arms Adjustable Gas Block. Less than 100rnds.
Spikes melonited gas...
REDUCED Used, low round count. NO BCG included. Shows light wear from use and handling. Less than 200rds fired. Will come with black Magpul slimline handguards so the front sling swivel has been removed for clearance. F marked FSB. I'm living between 2 houses right now so pics will be up...
This is a palmetto CHF build. Not the $300 kit. The $600 kit. Sitemark optic Magpul pro rear flip up. Yes it's priced high. Wasn't looking to sell it. But with the incoming ban I want to see what I could get for it. $1500. OBO up for trades as well.
Save your hatred I really don't care
Brand new in the box. Ended up picking up a LMT Upper for my MK18 build. Save a little cash over new and keeps me from dealing with returning it.
These are pretty good uppers considering you get a chrome lined FN cold hammer forged barrel for a fraction of the price of a complete FN upper.
Sorry, this item has sold
NIB Centurion Arms SOCOM Hammer Forged Barrel, Carbine (14.5 inch)
Just received it today, in the three weeks I was waiting for it I changed my mind! :rolleyes:
I will ship it for free and eat the taxes that I paid on it
Please PM me for any questions
Does anyone have user feedback for the Centurion Cold Hammer Forged barrels? Specifically wondering about if they are properly gassed and also their profiles. I want a mid length option but it appears that yhe just have their “lightweight” option in stock. I want a barrel suitable for a fighting...
1 Used URX 3.1 13.5" handguard AAC Marked, $245 shipped. SOLD
3 New/Like New URX 3.1 13.5" handugard also AAC marked.
1 with heat shield, $285 shipped
2 without heat shield, $265 shipped each. SOLD
Come with barrel nut.
1 Daniel Defense 16 inch CHF carbine length barrel, 150 rounds.
WTS, 16in PSA Premium CHF FN Barreled upper. Around 3k rounds through it, it's served me well and has eaten anything I've thrown into it. Will come with an extended charging handle but no BCG is included.
SOLD. Willing to ship.
Have a like new PSA Premium rifle with a 14.7 Cold hammer forged chrome lined FN barrel. It comes with a PSA premium bolt carrier group, Primary arms 1x Cyclops prism with a green ACSS reticle, Magpul pro steel back up iron sights, Stream light protac 1000 lumen light, strike industries extended...
Flush rotary mag model (5 round) - will NOT take AR mags, cannot be converted to take AR mags
Stock Flat Dark Earth Synthetic
Sights None - Scope Rail Installed
Material Alloy Steel
Magazine Flush fit rotary - 5 rounds
Twist 1:8" RH
Finish Matte Black
Weight 6.1 lb...
Up for sale are my two PSA 10.5” AR pistols with collapsible brace and CHF barrels.
The first one has the Midwest Industries rail with the nickel boron BCG. Never fired. Asking $700.
The second is your standard 10.5” AR Pistol with a CHF barrel. I’ve put only two thirty round magazines...