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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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英文字典中文字典相關資料:
  • 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
  • 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
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    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
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    So my car is due for plugs, and the stock replacement iridium and CA emissions specific plugs are $15 each, even from discount sites However, there are alternative platinums (which are also NGK just like OEM) for only $5 each I know iridium lasts longer than platinum, but I don’t plan on
  • Denso Iridium TT vs long life, which one is better?
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  • 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
  • PLATINUM VS. IRIDIUM | BobIsTheOilGuy
    Platinum and iridium will last a long time But iridium is better because it conducts better than platinum Actually, plain steel plugs [when brand new and sharp] have less resistance at the tips than platinum The new precious metal tipped plugs have a benefit in that they are quite small, and let gas in and out of the critical area better
  • 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!
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    Hello, First question - for anyone running a 00 + Tahoe Suburban, what do you typically get for MPG (summer and winter) Second question - In September, I removed the original Platinum plugs in my 01 Tahoe, and had the replacement Iridium plugs installed Without doing a 'scientific' MPG
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    Hey, I would only go with the factory iridium spark plugs or the ones specifically listed in the manual unless something has changed or GM made a mistake (unlikely) Looks like you need AC Delco 41-985 According the spark plug manufacturers, standard copper plugs can go about 30K, platinum plugs go 60-100K, and iridium about 120K These are general values and will depend on what the car





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