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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.
New unfired. Both the lower and upper were factory built by PSA.
Upper is a complete premium upper and has the FN marked PSA CHF 10.5 barrel. PSA premium full auto BCG. I added a BCM charging handle and MOE handguards. Along with a Colt takeoff Milspec Height square forge carry handle...
Premium PSA / FN 16-inch Mid-Length upper. Does not have bolt, carrier, charging handle or rear sight/carry handle.
Palmetto State sells these with FN built Cold Hammer Forged (CHF) chrome lined barrels.
Here is what PSA says about this barrel:
Barrel: A proprietary blend of Hammer forged...
Complete Upper Assembly w/ 16" CHF Barrell - only has 150 rounds through it
Will accept combo trade and cash for 5.56. Will negotiate.
Ive put about 1000 dollars into it. Full component list:
Radians Raptor Charging Handle
YHM 12.8" quad rail
BCM gunfighter muzzlebrake...
Brand new Cold Hammer Forged upper by Bravo Company
BFH 16” Light weight barrel (Cold Hammer Forged barrel).
556 NATO 1/7 twist
F stamped FSB
Mid-length gas system
BCM upper receiver (w/dust cover). There is no bcg
Bravo Company charging handle.
9" QRF handguard, Includes LaRue index clips...
Selling a brand new PSA AK-47 GF5 FORGED CHF CLASSIC - New in box, unfired. SOLD!!!!
I just picked it up from my FFL but decided not to keep it to fund other toys. Buyer agrees to pay associated FFL transfer paperwork. I am located in Bellevue so I am willing to meet FTF at an FFL within...
This is the FN barred PSA premium 10.5” Cold hammer forged ar15 pistol. It’s got maybe 200 rounds through it at most. It was my truck gun but it’s no longer being used. It’s got bcm lower parts and is a great rig for a truck gun.
-Complete factory PSA Premium 10.5 CHF w/ FN barrel w/...
Psa chf premium upper 10.5
Standard magpul hand gaurd
Will include aim surplus bcg for 100$ more
And if you buy the bcg get a free charging handle. Will upload actual pics when off work
PSA 10.5" CHF 1:7 A2 Carbine 5.56 NATO Premium Classic AR-15 Upper Assembly - No BCG/CH
Barrel Length: 10.5"...
First "I'll take it" posted unconditional is the new owner
cross posted on the web "First I'll take it" time stamp rules rules all
PRICE $250 CASH
Note: PM confirming the purchase commitment
Partial trades would M5 butt stock
Need a BCG maybe Tool Craft or other quality BCG
I do have a Nitride bolt carrier group I can sell with barrel Its not a spikes for $190
I have 2 1 left Spikes Tactical .308 CHF (Cold Hammer Forged) 18" Barrels about 200-300 rds fired each never been cleaned other than a patch ran through them. $280 each. These cost over $400 each from...
Selling my Allied Armament Polish (circle 11 / Random) Underfolder AK-47 as I need to raise / replenish funds due to recent purchases.
Built from a "new" 1981 Polish parts kit that includied the original military hammer forged chrome lined barrel.
Polish kits are of the highest quality and...
Gently used (less than 300rds) 11.5" Spike's Tactical 5.56 Upper. Has an unknown muzzle device, other than that everything is factory -
Has the Magpul MOE Handguard with Picatinny Railinstalled. 1/7 twist CL HP/MP. See pictures.
Just switching up to rifle setup, covering cost of a new (to me)...
Up on the chopping block is my FN marked PSA Premium 10.5 CHF pistol. It has a very low round count, under 200. Currently it’s sighted in at 100 yards and is as dead-on as you’d need for a truck gun. I put it together as a second truck gun to keep in my work rig, but I’ve still been using my...
So I bought this barrel to do a build but I decided I wanted a barrel with a FSP instead. The barrel is brand new, and it has a slim comp pinned and welded to make it 16". I'll copy and paste the specs below.
I am open for trades, some things I need/want are:
223/556 Bolt Carrier group
I have an assembled AR-15 Varmit style rifle. 20" CHF SS barrel 1/7 twist. 15" keymod rail. Upper came assembled from palmetto. I assembled lower from parts kit. Put about 100 rounds down tube. Too heavy for my style of hunting. Wanted it for coyote huting but can't give up my .243...
I’m building my first AR and am debating between choosing the the standard BCM 16” upper or their cold hammer forged upper (they call it BFH).
what are the pros and cons of having the barrel be cold hammer forged? I heard it increases durability, but reduces accuracy? I don’t mind the extra...
Selling my mint Palmetto State Armory AK-103 premium, which has the fantastic FN cold hammer forged, chrome lined barrel. Includes original paperwork and unused magpul 30 round pmag. Sights aren't canted and the rifle seems dang straight. Rivets are excellent. Black poly furniture and left...
I have a brand new in box Colt LE6920 16" AR. No, these are not the new AR's that Colt just started producing again. These have the "M4 Carbine" roll marks. I don't have any photos tonight but can get them tomorrow. I can also possibly throw in a PSA 10.5" AR pistol with a CHF barrel. At this...
NOTE: Upper and BCG/charging handle are new, MI handguards and carry handle sight are lightly used. This upper was installed on a lower but I never fired it. Sad I know....
PSA factory assemble upper with logo. This has the PSA premium CHF barrel made by FN. 5.56 Nato chamber and...