Carborundum brickThe product is in crystallization process, microscope of type of serve as a foil to of the photograph that use thing is made to industrial furnace take surface of SiC thick single crystal to have observation, discover a lot of helix state product.
Use answer ray interferometer method determined the height of the pitch of helix state product on 6H-a crystallization, prove its are equal to the parameter of this aberrant former crystal lattice highly. According to these the result can conclude: The account with each aberrant type produces in carborundum brick, because the reason that helix state product makes all round the layer is used in fault of different helix shape,the likelihood is.
According to speculation, when gas phase or fuse-element greatly when supersaturation, a shoot of form any crystalline substance will be made after exterior grain gathers, because foreign matter distributings to all do not reach heat,exchange inhomogenous, among them internal stress increases somewhat. These elements bring about a bud of form any crystalline substance to receive compress, till produce plasticity,be out of shape. If homogeneous deformation stops abruptly, produce helix shape fault to move, spiral shape like a staircase is formed in crystal surface paragraph. The crystal that gets growth further wants to will have helix shape ladder paragraph structure, this ladder Duan Fu shows cycle to be equivalent to the pitch that helix shape fault uses. Accordingly, different helix shape fault is moved bring about make each kind aberrant.
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