Nasucha, Chaizi (2014) Pengaruh variasi feed rate dan jumlah sapuan komposit YSZ-Al2O3 terhadap ketahanan termal dan kekuatan lekat pada YSZ/YSZ-Al2O3 double layer TBC untuk aplikasi nosel roker. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
TBC (Thermal Barrier Coating) denganYSZ/YSZ- Al2O3 top
coat (TC) dan MCrAlY sebagai bond coat (BC) yang selanjutnya
disebut sebagai YSZ/YSZ- Al2O3 double layer TBC digunakan
sebagai aplikasi material perintang panas pada dinding dalam
nosel roket. Pelapisan dilakukan dengan variasi feed rate dan
jumlah sapuan komposit YSZ Al2O3- Al2O3. Feed rate yang
digunakan sebesar 14,17 dan 20 g/min dengan sapuan 1,2 dan
3x. Dengan semakin naik nya feed rate dan jumlah sapuan
diharapkan coating yang memiliki porositas yang rendah, tahan
terhadap termal dan juga memiliki kekuatan lekat yang tinggi.
Pada penelitian ini bond coat dan top coat dilapiskan
dengan metode flame spray dengan jarak spray dan juga
komposisi komposit YSZ- Al2O3 dijaga konstan pada jarak
200mm dan komposisi 30% Al2O3.. Kemudian dilakukan
pengujian termal, pull off test, dan SEM-EDX XRD. Pengujian
termal yang dilakukan ada dua tipe yaitu Thermal Torch Test dan
Non-Isothermal Oxidation Test. Thermal Torch Test ditujukan
untuk mengukur ketahanan dari struktur TBC terhadap penetrasi
dari api las oxyacethylene sebagai miniatur uji statik nosel roket
hingga spesimen mencapai kegagalan. Uji termal TGA untuk
mengukur ketahanan terhadap oksidasi non-isotermal dan
viii
mengamati pertumbuhan TGO (Thermally Grown Oxide)
diantara lapisan TC/BC, pengujian ini dilakukan sampai
temperatur 1000o C dengan laju temperatur 10oC/min.
Dari hasil penelitian didapatkan bahwa semakin besar feed
rate menyebabkan serbuk yang terdeposisi semakin banyak
mempermudah mencapai ketebalan yang diharapkan dengan
kepadatan yang optimal. Semakin banyak jumlah sapuan
membuat kompleksitas mikrostruktur semakin tinggi dan
menyebabkan kekuatan lekat dan ketahanan termal semakin
rendah. Hal ini berkebalikan dengan hipotesis awal. Hasil
pengujian TGA menunjukkan pada sampel yang dicoating mulai
teroksidasi pada temperature 900 oC, dan dengan analisa 1st
Derivative didapatkan sampel paling stabil adalah 17 g/min-1x
dan dari pengujian Thermal Torch sampel 17 g/min-1x memiliki
ketahanan terhadap pengerusakan yang baik. Kekuatan lekat
paling tinggi juga terdapat pada komposisi 17 g/min- 1x dengan
nilai rata-rata 17.17 Mpa. =========== TBC (Thermal Barrier Coating) with YSZ/YSZ- Al2O3 as top
coat (TC) and MCrAlY as a bond coat (BC) mark as YSZ/YSZAl2O3
double layer TBC was used as material for thermal
barrier coating on the inside wall of rocket nozzle. Coating have
done with feed rate and pass variations of YSZ- Al2O3. Composite.
The composite layer was coated by feed rate variation at 14,17
and 20 g/min and various amounts of pass 1,2 and 3x pass. Early
hypothesis of this study said that with the increase of powder feed
rate and pass couse coating properties better with have a low
porosity and have a good thermal resitance and adhesion
strength.
In this research, the bond coat and top coat were coated by
using flame spray method. The spray distance and compotition of
YSZ-Al2O3 composite were kept constant on 200mm and 30%
Al2O3. Next, thermal tests, Pull off tests, SEM-EDX and XRD were
conducted. Thermal test divided into two part, Thermal Torch and
Non-isothermal Oxidation Test. Thermal Torch used for measure
the resistance of TBC structure against oxyacethylene flame
penetration as a miniature of thermal static test for rocket nozzle
until the specimen was failure. Non-Isothermal Oxidation Test.
used to measure the resistance against non-isothermal oxidation
x
and investigated the growth of TGO (Thermally Grown Oxide)
layer on interface between TC/BC, this test was done at 1000o C
with heating rate 10oC/min.
From the results, we obtained that the faster the feeding rate
the more powders were being deposited, making it easier to
obtain the desired thickness with optimum density. The more pass
given, increase the complexity of the microstructures and caused
the adhesiveness and the thermal resistance lower. These results
were showing the opposite of the early hypothesis. The TGA
results indicated that all the samples that coated begun oxidizing
at 900oC, and through 1st Derivative analysis the most stable
sample obtained was 17 g/min-1x and from the Thermal Torch
tests, the sample 17 g/min-1x owned good demolition resistance.
The highest adhesiveness was also obtained by sample 17 g/min-
1x with an average of 17.17Mpa.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 667.9 Nas p |
| Uncontrolled Keywords: | TBC, Nosel Roket, Feed Rate, YSZ-Al2O3, TGO, Kekuatan Lekat, Rocket Nozzle, Feeding Rate, YSZ-Al2O3, TGO, Adhesiveness. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA491 Metal coating. |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 26 Mar 2019 06:38 |
| Last Modified: | 26 Mar 2019 06:38 |
| URI: | http://repository.its.ac.id/id/eprint/62581 |
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