Feem ntau, lub ntsej muag thiab lub ntsej muag kawg ntawm thawj lub nplhaib yog chrome-plated, thiab lwm cov piston rings tuaj yeem ua chrome-plated. Loj marine diesel cav piston rings tsis yog chrome-plated, thiab lub tog raj kheej liner yog chrome-plated. Tam sim no, chrome-ceramic composite txheej piston nplhaib tau tsim, thiab qhov kev ntsuam xyuas qhia tau hais tias tus nqi hnav tsawg dua li ib nrab ntawm cov chrome-plated piston nplhaib, thiab tus nqi hnav ntawm lub tog raj kheej liner kuj raug txo.

Molybdenum sprayed txheej muaj zoo hnav tsis kam, copyability thiab tensile lub tog raj kheej tsis kam tshaj chrome plating. Chrome-plated steel lub tog raj kheej liner thiab molybdenum-sprayed piston nplhaib tuaj yeem tsim muaj kev sib txhuam zoo.

Feem ntau siv tawv txheej rau piston rings yog aluminium oxide, titanium oxide thiab chromium oxide, feem ntau yog txhuas titanate txheej.

Cov txheej txheem ion implantation muab cov tshuaj lom neeg xaiv rau hauv ib pob rau hauv lub tog raj kheej liner thiab piston nplhaib nto. Cov txheej txheej ion txhaj tshuaj yog ua ke nrog rau saum npoo ntawm lub tog raj kheej liner thiab lub nplhaib piston, thiab muaj kev cuam tshuam me ntsis ntawm qhov roughness thiab qhov tseeb qhov tseeb. Muaj cov plasma plating TiN diffusion txheej, nto ion plating CrN nyuaj zaj duab xis, tsawg ntiaj teb ion carburizing thiab hais txog. Cov kev sim qhia tau hais tias quenching thiab tempering lub nplhaib piston thiab tom qab ntawd nitriding nto ntawm lub ntiaj teb tsis tshua muaj ions tuaj yeem txhim kho qhov hnav tsis kam ntawm lub nplhaib piston thiab ua kom nws lub neej ua haujlwm ntev.

Kev kho deg lubrication yog los tsim cov hlau sib xyaw zaj duab xis rau saum npoo ntawm hlau, hlau thiab hmoov metallurgy cov ntaub ntawv los ua lub luag haujlwm ntawm tus kheej lubricating. Muaj feem ntau yog chav phosphating kho zaj duab xis tsim thiab alkaline oxidation kho zaj duab xis tsim, uas yog siv rau lamination ntawm piston rings thiab lub tog raj kheej liner ntawm me me hauv combustion xyaw. Tsis tas li ntawd, kua nitriding thiab mos nitriding kuj tuaj yeem txhim kho qhov hnav tsis kam ntawm lub tog raj kheej liner.

Qhov hnav tsis kam ntawm kev sib txhuam khub yog cuam tshuam los ntawm ntau yam, yog li qhov saum npoo tau nce kho nrog ntau yam hnav tsis kam. Piv txwv li: tshuaj tua hluav taws thiab sulfurizing, carburizing quenching thiab sulfurizing, mos nitriding thiab sulfurizing, nitroxide thiab ua ke ntawm chrome plating thiab molybdenum tshuaj tsuag.