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iridium    音標拼音: [ɪr'ɪdiəm]
n. 銥



iridium
n 1: a heavy brittle metallic element of the platinum group;
used in alloys; occurs in natural alloys with platinum or
osmium [synonym: {iridium}, {Ir}, {atomic number 77}]

iridium \i*rid"i*um\ ([-i]*r[i^]d"[i^]*[u^]m), n. [NL., fr. L.
iris, iridis, the rainbow. So called from the iridescence of
some of its solutions. See {Iris}.] (Chem.)
A rare metallic element of atomic number 77, of the same
group as platinum, which it much resembles, being
silver-white and indifferent to most corrosive agents, but
harder, more brittle, and with a higher melting temperature
(2410[deg] C, versus platinum 1772[deg] C). With the
exception of osmium, it is the heaviest substance known, its
specific gravity being 22.4. Symbol Ir. Atomic weight 192.22.
[1913 Webster PJC]

Note: Iridium usually occurs as a native alloy with osmium
(iridosmine or osmiridium), which may occur alone or
with platinum. Iridium, as an alloy with platinum, is
used in bushing the vents of heavy ordnance. It is also
used for the points of gold pens, and in a finely
powdered condition (iridium black), for painting
porcelain black.
[1913 Webster]

iridium
Symbol: Ir
Atomic number: 77
Atomic weight: 192.217
Very hard and brittle, silvery metallic transition element. It has a
yellowish cast to it. Salts of iridium are highly colored. It is the
most corrosion resistant metal known, not attacked by any acid, but is
attacked by molten salts. There are two natural isotopes of iridium, and
4 radioisotopes, the most stable being Ir-192 with a half-life of 73.83
days. Ir-192 decays into {platinum}, while the other radioisotopes decay
into {osmium}. Iridium is used in high temperature apparatus, electrical
contacts, and as a hardening agent for platinum. Discovered in 1803 by
Smithson Tennant in England. The name comes from the Greek word iris,
which
means rainbow. Iridium metal is generally non-toxic due to its relative
unreactivity, but iridium compounds should be considered highly toxic.

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  • NGK Iridium IX vs Laser Iridium | BobIsTheOilGuy
    The Laser Iridium plugs have a wider center electrode, whereas the IX has a more narrow one I think that's why the Laser Iridiums last longer as well as the double precious metals, iridium on center electrode, platinum on side electrode I've had friend who bought the IX and worked well, but it's longevity AND performance that I look for
  • Reasonable Iridium Plug change interval | BobIsTheOilGuy
    What would be a reasonable Iridium Plug change interval? I have Denso Iridium Power II's, which Denso rated for 30k miles back in 2014 or so when I put them in I rechecked and now Denso Europe gives them just 20k miles I heard a lot of people claim 60-70k miles on them are no problem Now the
  • Fresh Paint, And That’s It, For The 2026 Honda NT1100
    2026 Honda NT1100 Photo: Honda The Euros just announced a fresh coat of paint for the bike in 2026, and presumably the US will see similar options next year Europe gets Iridium Gray Metallic, Mat Warm Ash Metallic and Pearl Hawkseye Blue options; look for something along those lines coming stateside, when the updated models arrive
  • Iridium vs Ruthenium spark plugs | BobIsTheOilGuy
    There is little I can find about Ruthenium spark plugs, except it's the new sliced bread, better, last longer, etc etc If the Laser iridium have indeed only one iridium (or platinium + iridium) pointy electrode, I can see the Ruthenium lasting longer So, what's your take ? Can you educate me on spark plugs ? On most 4 cylinder they are real easy to replace so I always them as a maintenance
  • Iridium spark plug resistance | BobIsTheOilGuy
    Iridium more or less the same as ordinary copper core resistor plugs Again: it never seize to amuse me as to where these "info" comes from RE: iridium has higher resistance than copper core, etc Q Remember 1 thing: regardless of how relatively exotic the materials used in automotive spark plugs these days: your electronic ignition system on your gasoline automotive engine is more than
  • Copper vs Iridium spark plugs? | BobIsTheOilGuy
    What is the real advantage to Iridium plugs? Simply longevity, or is the spark actually any different with the very fine tip? Silly question, but I have a snowmobile with a Suzuki 660cc 3 cyl 4 stroke EFI engine I'm quite sure it's a JDM small vehicle engine used in multiple applications
  • Platinum or Iridium Plugs for OPE? | BobIsTheOilGuy
    The only reason platinum and iridium spark plugs are made is for vehicle engines that run hotter, leaner fuel mixtures to meet emissions control requirements AND have a long service life while doing it! Garden equipment applications simply can't push conventional plugs hard enough to make a difference!
  • Go with Denso Iridium TT trend or Long Life OE spark plugs?
    The manual calls for Denso Iridium Long Life plugs to be changed at 160k km Cars at 320k so second swap and I noticed Denso has new TT plugs with smaller 0 4mm center electrode as opposed to 0 7mm in long life Previously 0 4mm center electrode is for the "performance" plugs and generally
  • NGK Iridium IX vs NGK Laser Platinum | BobIsTheOilGuy
    No Laser Iridium for your Pathfinder? In that case, consider Denso Iridium TT, Denso Iridium Long Life, or NGK Ruthenium If the job is difficult, you want a long-lasting iridium or ruthenium, so you won't have to do it again for a long time
  • iridium plugs. do they make a difference | BobIsTheOilGuy
    Copper or iridium plugs alone, used with stock resistive wires, make minimal difference (from the minimal resistance difference) Modern engines may benefit more from the more durable iridium which allows making the electrode smaller for a very slight increase in combustion speed





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