Publication: Recubrimientos de boro depositados por "pack cementation" sobre substratos de aleación de TI pulmimetalúrgicos y laminados
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2009
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2009
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Abstract
En el presente proyecto se ha estudiado la deposición de recubrimiento de boro sobre la aleación Ti-6Al-4V pulvimetalúrgica y laminada. Las muestras laminadas fueron proporcionadas por el Departamento de Materiales, mientras que las probetas pulvimetalúrgicas se fabricaron en el laboratorio a una temperatura de sinterización de 1200 ºC. Se aplicó distinto grado de acabado superficial a las probetas Ti-6Al-4V (salvo las laminadas), con el objetivo de determinar la porosidad y rugosidad de las mismas. A continuación se procedió al recubrimiento de las muestras de titanio utilizando dos tipos de mezclas en presencia de boro. La primera constituida por 3% de NH4Cl, 20% de B4C y 77% de Al2O3 en peso y la segunda constituida por 3% de NH4Cl, 20% de B y 77% de Al2O3 en peso. Se realizaron simulaciones termodinámicas a través del programa Thermo-calc que permitieron dar una primera idea de los gases precursores y las fases estables constituidas en el recubrimiento formado. Para la caracterización de los materiales revestidos se hizo uso de Difracción de Rayos-X (DRX) y Microscopía Electrónica de Barrido (MEB). Los resultados mostraron relación entre la adherencia del recubrimiento constituido y el nivel de rugosidad del substrato. Así mismo, se comprobó la presencia de recubrimientos multicapa en presencia de boro sobre los substratos de Ti-6Al-4V, con diferencias respecto el metal donador de boro utilizado (B4C o boro amorfo). _______________________________________________________________________
In this present project it has studied the boron coating deposition on powder metallurgy and laminated Ti-6Al-4V alloy. Laminated samples were provided by Materials Department, while powder metallurgy test specimens were made in the laboratory at sintering temperature of 1200º C. It was applied different level of surface finishing on Ti-6Al-4V samples (except laminated), with the objective of obtaining the porosity and roughness of them. Next, it was proceed to coat the titanium samples using two kinds of mixtures in presence with boron. The first was constituted by 3% NH4Cl, 20% B4C and 77% Al2O3 in weight and the second by 3% NH4Cl, 20% B y 77% Al2O3 in weight. It was realized thermodynamic simulations by Thermo-calc program which allowed giving a first idea about precursors gases and stable phases constituted in the coating. For the characterization of the materials coated it was used X Ray Diffraction (XRD) and Scanning electron Microscopy (SEM). The results showed a relationship between the coating adhesion built and the level of substrate roughness. In addition, it was verified the presence of multilayer coating with boron on Ti- 6Al-4V substrates, with differences between the boron metal donor used (B4C or amorphous boron).
In this present project it has studied the boron coating deposition on powder metallurgy and laminated Ti-6Al-4V alloy. Laminated samples were provided by Materials Department, while powder metallurgy test specimens were made in the laboratory at sintering temperature of 1200º C. It was applied different level of surface finishing on Ti-6Al-4V samples (except laminated), with the objective of obtaining the porosity and roughness of them. Next, it was proceed to coat the titanium samples using two kinds of mixtures in presence with boron. The first was constituted by 3% NH4Cl, 20% B4C and 77% Al2O3 in weight and the second by 3% NH4Cl, 20% B y 77% Al2O3 in weight. It was realized thermodynamic simulations by Thermo-calc program which allowed giving a first idea about precursors gases and stable phases constituted in the coating. For the characterization of the materials coated it was used X Ray Diffraction (XRD) and Scanning electron Microscopy (SEM). The results showed a relationship between the coating adhesion built and the level of substrate roughness. In addition, it was verified the presence of multilayer coating with boron on Ti- 6Al-4V substrates, with differences between the boron metal donor used (B4C or amorphous boron).
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Pulvimetalurgia, Aleaciones de titanio, Ensayo de materiales