As an alternative, materials such as graphite, carbon fiber reinforced graphite, silicon carbide or carbon fiber reinforced silicon carbide can be coated with silicon in order to avoid {HEAD ~ contamination} of {TAIL ~ the product}, particularly contamination with carbon or with silicon carbide particles 
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As an alternative , materials such as graphite , carbon fiber reinforced graphite , silicon carbide or carbon fiber reinforced silicon carbide can be coated with silicon in order to avoid { HEAD ~ contamination } of { TAIL ~ the product } , particularly contamination with carbon or with silicon carbide particles
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