Objective
1.To determine the surface reactivity of silicon nitride matrices and corresponding silicon nitride-silicon carbide composites in environments representative of fossil fuel conversion systems.
2.To determine how the presence of impurities such as sulphur vapour, sulphur dioxide and chlorine within the corrosion environment affects the surface reactivity of silicon nitride and silicon nitride-silicon carbide composites.
3.To elucidate the mechanisms of high temperature chemical degradation in corrosive environments, which contain either oxygen or sulphur or chlorine.
4.To optimise the composition of composites in terms of additive and silicon carbide content for use in aggressive situations.
The objectives of the project are:
to determine the surface reactivity of silicon nitride matrices and corresponding silicon nitride silicon carbide composites in environments representative of fossil fuel conversion systems;
to determine how the presence of impurities such as sulphur vapour, sulphur dioxide and chlorine within the corrosion environment affects the surface reactivity of silicon nitride and silicon nitride silicon carbide composites;
to elucidate the mechanisms of high temperature chemical degradation in corrosive environments, which contain either oxygen or sulphur or chlorine;
to optimise the composition of composites in terms of additive and silicon carbide content for use in aggressive situations.
Achievements to date include the acquisition of oxidation data relating to the datum matrix material (silicon nitride densified with 7 w/o yttria, 4 w/o) and the datum composite material (ie datum matrix material containing 10 w/o silicon carbide particles) and chloridation data relating to the data matrix and composite materials.
The effects of silicon nitride matrix composition and silicon carbide additions on the corrosion of silicon nitride based materials have been studied. Six beta-sialon matrices with z-values of 0.2 0.5 1.0 1.5 2.0 and 3.0 and five composites comprising beta-sialon matrices with z-values of 0.2 0.5 1.0 2.0 and 3.0 plus 10% by weight silicon carbide particles (below 5 um) were prepared by pressureless sintering. In addition an aluminium free hot isostatic press (HIP) processed beta-silicon nitride and reaction bonded silicon nitride were tested. Corrosion results obtained at 1150 and 1350 C in environments comprising:
argon 20%, oxygen 2%, chlorine;
hydrogen 10%, hydrogen sulphide 2%, water vapour;
nitrogen 15%, carbon dioxide 4%, oxygen 0.2%, sulphur dioxide
showed that for each of the three environments the HIP processed beta-silicon nitride and the z=3.0 matrix and composite materials exhibited the best corrosion resistance. The composite materials showed no significant improvements in corrosion resistance and room temperature indentation toughness which would offset increased fabrication difficulties and accordingly matrix materials are to be preferred for corrosion resistance. The composite materials showed no significant improvements in corrosion resistance and room temperature indentation toughness which would offset increased fabrication difficulties and accordingly matrix materials are to be preferred for corrosion resistant materials. The mechanism of corrosion at 1350 C in each of the 3 environments involves the formation of large volumes of low viscosity liquid phases. These large volumes of liquid enable the solution of silicon nitride/sialon grains to occur and it is this process which is responsible for corrosion.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering composites
- natural sciences chemical sciences inorganic chemistry inorganic compounds
- natural sciences chemical sciences inorganic chemistry halogens
- engineering and technology environmental engineering energy and fuels
- natural sciences chemical sciences inorganic chemistry metalloids
You need to log in or register to use this function
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Data not available
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Data not available
Coordinator
LIMERICK
Ireland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.