Lub melting point ntawm cov hlau lead

Coj - hlau xiavlus Hawj txawm muaj ib tug loj kev nqus thiab tshuam yam tsawg kawg nkaus hardness (yuav tsum txiav nrog ib tug riam). Lub melting point ntawm cov hlau lead Nws yog zoo li hais tias nws yuav melted nyob rau hauv qhov hluav taws kub los yog nyob rau hauv lub tsev. Ntshiab txhuas sai sai them nrog ib tug oxide zaj duab xis thiab tarnish. Thaum ib txwm kub lead yog inert rau feem ntau acids.

Lub melting point ntawm cov hlau lead, tsis muaj impurity, kwv yees li txog 328 degrees. Lub molten daim ntawv ntawm cov hlau muaj ib tug zoo castability. Thaum pouring cov hlau lead mus rau hauv cov xuab zeb tuaj pwm yog tsim nyog tias cov hlau muaj zoo fluidity, no kawg, lub qhuav yog coj mus rau ib tug kub saum toj no lub melting point ntawm kwv yees li 100-120 degrees. Yooj yim machined, forged, siab ductility hlau laminate tso cai rau nws mus rau lub yam tsawg kawg nkaus daim ntawv thickness yooj yim.

Lub ib kub npau npau taw tes ntawm cov hlau lead yog nyob rau hauv ntau 1749 °.

Nyob rau hauv lub molten lub xeev nws muaj ib tug tseem ceeb volatility, uas tsub kom nrog kub. Plua tshauv hmoov txhuas, thiab ib tug khub ntawm cov hlau lead oxides yog lom rau tib neeg lub cev. Cov muaj nyob rau hauv tus kab mob ntawm 0.3 g ntawm hmoov txhuas los yog nws cov yam, ua rau yus mus rau mob hnyav lom. Nyob rau hauv lub crystallization txheej txheem ib tug loj lead nws shrinkage, nws yog feem ntau hais txog 3.5%. Lub ntiaj teb ua kiav txhab lead yog feem ntau pom nyob rau hauv daim ntawv ntawm cov tebchaw, nyob hauv cov ntshiab daim ntawv no, nws yog heev tsis tshua muaj.

Nws pom hais tias nws yog tsuas yog nyob rau hauv daim ntawv ntawm cov sulfides nyob rau hauv ntau yam pob zeb.

Raws li impurities nyob rau hauv nws tej zaum yuav hais xws li antimony, tooj liab, hlau, tin, Bismuth, arsenic, sodium, etc. Feem ntau ntawm cov impurities yog undesirable, tshwj xeeb yog nyob rau hauv lub chaw ua khoom ntawm ib qho tseem ceeb qhov chaw, vim hais tias lawv ua rau ib tug kev hloov kho ntawm cov tshuaj thiab txhua yam khoom ntawm cov hlau. Zinc thiab txhuas Bismuth txo kuj mus acids. Lub xub ntiag ntawm magnesium los yog poov hlau ua rau ib qho kev nce nyob rau hauv lub dag lub zog, thiab lub hlau alloyed nrog antimony, yus muaj los ntawm ntau yam kev nce ntawm hardness.

Tooj tsub kom kuj ntawm lub lead khoom sulfuric acid, barium thiab lithium nce hardness. Lub melting point ntawm hmoov txhuas nyob rau hauv lub xub ntiag ntawm impurities tsis yauv tseem ceeb kev hloov. Cov kab kev los ntawm daim ntawv thov ntawm cov khoom los ntawm cov hlau lead ntau txaus. Major tau txais kev pab ntawm no cov ntaub ntawv uas yog pom tias yuav cable thiab cov roj teeb ntau lawm, qhov twg nws yog siv raws li lub cable sheath thiab nyob rau hauv qhov siv thiab ua roj teeb paib.

Ua los ntawm cov hlau lead txhaj koob tshuaj tivthaiv thiab cia nyias qhov. Qhov tsawg melting point ntawm cov hlau lead tso cai nyob rau hauv lub dhau los lawm los ntawm cov neeg tua tsiaj ua cia nyias qhov thiab txhaj koob tshuaj tivthaiv.

Anticorrosive muaj peev xwm ntawm cov hlau lead cia nws siv rau kev thov ib tug tiv thaiv txheej ntawm cov khoom ua los ntawm hlau. Nyob rau hauv tas li ntawd, cov cuab yeej no ntawm cov hlau lead yog dav siv nyob rau hauv qhov siv thiab ua cov xim tsev thiab varnishes. Ib tug loj feem ntawm lub nkoj minium, uas xim lub underwater ib feem ntawm lub nkoj, yog ib tug xim raws li nyob rau hauv cov hmoov txhuas.

Cov hmoov txhuas sheath muaj peev xwm sawv ntawm kev tiv thaiv tiv thaiv xeb hluav taws xob thiab xov tooj cable nteg nyob rau hauv lub hauv av thiab dej nyob rau hauv ib tug hostile ib puag ncig. Thaum dab tsi kub yaj hmoov txhuas, tin, Bismuth thiab cadmium, mus rau hauv tus account nyob rau hauv lub chaw ua khoom ntawm hluav taws xob fuses. Kom txog rau thaum hnub no kev thov lead-acid roj teeb nyob rau hauv lub tsheb, tiv thaiv, thiab lwm yam lag luam. Txawm li cas los, nyob rau hauv tsis ntev los no xyoo nws pib mus rau kev koom siv npib tsib xee-cadmium roj teeb.

Lead nyob rau hauv lub hlau muaj pes tsawg leeg yog dav siv nyob rau hauv qhov siv thiab ua babbitt kabmob solder ntawm tin thiab txhuas alloys printing. Cov ntawv uas ua los ntawm cov hlau lead-shielded X-rays thiab tej tawg. Ib tug huam yuaj tshwm sim nyob rau hauv 1986, nyob rau lub Chernobyl, nrog mob siab heev tej tawg, nyob rau hauv thiaj li yuav tso tseg cov txheej txheem nyob rau hauv lub reactor, siv hnab ntawm hmoov txhuas txhaj koob tshuaj tivthaiv thiab txhuas teb.

Yuav kom tiv thaiv cov neeg nyob rau hauv lub nyoob hoom qav taub lodged lub nra hnyav no, ua los xij tau siv. Lub cim thaj chaw ntawm cov hlau lead hauv cov ntaub ntawv no muab tau indispensable.