Pengaruh Variasi Jarak Spray Pelapisan FeCrMnNiCSi Metode Wire Arc Spray Terhadap Abrasive Wear Resistance dan Porositas Grey Cast Iron FC 25

Kurniawati, Fajar (2017) Pengaruh Variasi Jarak Spray Pelapisan FeCrMnNiCSi Metode Wire Arc Spray Terhadap Abrasive Wear Resistance dan Porositas Grey Cast Iron FC 25. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada operasi mesin motor, ruang pembakaran akan menghasilkan tekanan dan temperatur gas yang tinggi sehingga untuk mencegah kebocoran kompresi ini pada piston dipasang ring guna memperkecil celah antara dinding cylinder liner dengan piston yang bergerak bolak balik. Gesekan antara ring piston dan cylinder liner menyebabkan permukaan silinder tergerus hingga mengakibatkan hilangnya material dari komponen, peristiwa tergerusnya permukaan lain oleh partikel yang lebih keras disebut Abrasive wear atau keausan abrasif. Keausan dapat dikurangi dengan memilih bahan cylinder liner yang bersifat tahan terhadap gesekan sekaligus memiliki pemuaian rendah, sifat ini dimiliki oleh grey cast iron. Untuk meningkatkan ketahanan aus pada penelitian ini dilakukan proteksi lebih berupa pelapisan logam FeCrNiMnCSi pada substrat grey cast iron FC 25 menggunakkan metode wire arc spray, dengan variasi jarak spray 100mm, 150mm, 200mm, dan 250mm. Hasil uji porositas menunjukkan bahwa semakin jauh jarak spray maka nilai porositasnya semakin kecil, didapatkan presentase nilai porositas terendah 5,4974% pada jarak spray 250mm. Sementara hasil pengujian ketahanan abrasiv menunjukkan nilai ketahanan abrasif tertingi sebesar 27,688rotation/mg dengan jarak spray 250mm. Hal ini menunjukkan bahwa semakin jauh jarak spray nilai ketahanan abrasif semakin besar. ======================================================================================================================== In operation of motor engine, co m bustion chamber will produce high pressure and gas temperature in order to avoid leakage of co m pression the piston is installed ring to minimize the gap between cylinder liner wall and piston. F riction between the piston rings and the cylinder liner cause the cylinder surface crumble to the point of loss of material from the component, another erupted surface by the more violent particles called Abrasive wear. Wear can be reduced by choosing a cylindrical liner material that is resistant to friction and has low expansion, this property and the properties is owned by gray cast iron To improve the wear resistance in this r esearch, protection of FeCrNiMnCSi metal coating on gray cast iron FC 25 substrate has been added using wire arc spray method with variation of spray distance of 100mm, 150mm, 200mm and 250mm. Porosity test results showed that the longe r distance spray , th e porosity value is smaller, obtained percentage of the lowest porosity value of 5.4974% at 250mm spray spacing. While the abrasive resistance test results show the highest abrasive resistance value of 27,688 rotation / mg with a spray spacing of 250mm. Thi s indicates that the greater the spray distance the greater the abrasive resistance value

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Cylinder liner , Besi Cor Kelabu, FC25, Keausan, Ketahanan Abrasif.
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User: Fajar Kurniawati .
Date Deposited: 07 Sep 2017 07:24
Last Modified: 05 Mar 2019 07:08
URI: http://repository.its.ac.id/id/eprint/43300

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