A comprehensive study on the processing and characterization of carbonpolyoxymethylene composites

Kurakin, Petr (author), Slemenik Perše, Lidija (mentor)

This study focuses on the development of processing and characterization of polyoxymethylene (POM) with carbon black (CB) particles. The introduction of CB as a filler serves to enhance POM's low friction and increased wear resistance, as well as increased stiffness, enabling the material to endure more substantial usage. Among the various industries that stand to gain from this improved material, the automotive sector could benefit significantly by incorporating POM/CB gears into car transmissions. In the present study, a low-pressure injection molding was used to produce high quality components. Various characterization methods were employed to determine the properties of composites. Firstly, differential scanning calorimetry (DSC) was used to determine the melting and crystallization temperatures of the purchased raw material pellets (POM/CB composite), which were later used to optimize the injection molding parameters. The main focus was on observing the material behavior during and after processing. After manufacturing, various tests such as amplitude and frequency sweeps were made to determine the rheological properties, while DMA tests were used to determine the mechanical properties. Finally, DSC was repeated to compare the material properties before and after the components were manufactured. The knowledge gained in this study enables the investigation of the material behavior during processing and understanding of the process of highly commercial low-pressure injection molding of thermoplastics specially designed for intricate shapes. In addition, the use of various tests enables future optimization of the processing and operating parameters of the material. Several disciplines such as mechanics and rheology influence each other in the tests, so a more in-depth study of their interactions is recommended.

• Language: English
• Keywords: carbon black, injekcijsko brizganje, karakterizacija, kompoziti, mehanske lastnosti, polioksimetilen, reološke lastnosti, termične lastnosti
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [P. Kurakin]
• Year: 2024
• Number of pages: XII, 44 f.
• PID: 20.500.12556/RUL-154843
• UDC: 620.17:665.777.2:678.027.74(043.2)
• COBISS.SI-ID: 187858691
• Publication date in RUL: 06.03.2024

Secondary language

• Language: Slovenian
• Title: Raziskava o predelavi in karakterizaciji ogljiko-polioksimetilenskih kompozitov

Abstract

Ta naloga se osredotoča na razvoj predelave in karakterizacijo polioksimetilena (POM) z ogljikovimi »carbon black« (CB) delci. Uvedba CB kot polnila služi izboljšanju nizkega trenja POM in povečane odpornosti proti obrabi ter povečane togosti, kar omogoča, da je material primeren za daljšo uporabo. Med različnimi industrijami, ki lahko pridobijo s tem izboljšanim materialom, bi lahko avtomobilski sektor znatno pridobil z vključitvijo zobnikov POM/CB v avtomobilske menjalnike. Za izdelavo visokokakovostnih komponent je bil v predstavljenem delu uporabljen proces nizkotlačnega injekcijskega brizganja. Za določitev lastnosti kompozitov so bile uporabljene različne karakterizacije. Najprej smo z diferenčno dinamično kalorimetrijo (DSC) določili temperature taljenja in kristalizacije kupljenih surovinskih granul (kompozit POM/CB), ki smo jih kasneje uporabili za optimizacijo parametrov brizganja. Pri tem smo se osredotočili na opazovanje vedenja materiala med obdelavo in po njej. Po izdelavi so bili za določitev reoloških lastnosti opravljeni različni testi, kot so amplitudni in frekvenčni testi, za določitev mehanskih lastnosti so bili uporabljeni DMA testi. Nazadnje je bil ponovljen DSC za primerjavo materiala pred in po izdelavi komponent. Znanje, pridobljeno v tej nalogi, omogoča raziskovanje vedenja materiala med predelavo in razumevanje procesa visoko komercialnega nizkotlačnega brizganja termoplastov, posebej zasnovanih za zapletene oblike. Poleg tega uporaba različnih testov omogoča prihodnjo optimizacijo procesnih in obratovalnih parametrov materiala. Več disciplin, kot sta mehanika in reologija, pri testih vpliva druga na drugo, zato je priporočljiva bolj poglobljena študija njihovih interakcij

• Keywords: carbon black, characterization, composites, low-pressure injection molding, mechanical properties, polyoxymethylene, rheological properties, thermal properties