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Provided are a composite silicon carbide substrate and a preparation method therefor. The composite silicon carbide substrate comprises a single crystal layer, a bonding layer and a support layer which are stacked in sequence; a surface of the single crystal layer is provided with a periodic atomic step structure; the atomic step structure comprises any one of a four-width step structure, a two-width step structure or a single-width step structure. The preparation method comprises: (1) bonding a support layer with an ion-implanted single crystal substrate, and performing a heat treatment and detaching to obtain an intermediate product of the composite silicon carbide substrate; and (2) subjecting a surface of a single crystal layer of the intermediate product of the composite silicon carbide substrate obtained in step (1) to oxidation modification and polish removal alternately, that is, forming a periodic atomic step structure on the surface of the single crystal layer, to obtain the composite silicon carbide substrate. The composite silicon carbide substrate meets the needs of high-voltage power devices for silicon carbide epitaxial layers with a large thickness and high quality, and the preparation method is simple and efficient, and has good controllability.

The utility model belongs to the field of inkjet printer, concretely is a kind of traceability inkjet printer for food safety, including base, the rear side fixed mounting of base top end has laser inkjet printer, the middle part of base top end is equipped with placing groove, the front and rear sides of base in placing groove are evenly provided with drive assembly, the inside of drive assembly is provided with limiting component;The limiting component includes the cavity plate being arranged in the inside of placing groove, the rear end of cavity plate is fixedly connected with vacuum pump.The utility model places the package in the inside of placing groove below laser inkjet printer, when, now rodless cylinder self-operation drives suction cup to move to the surface of package, after can drive vacuum pump and utilize suction cup to carry out negative pressure adsorption to package, so that subsequent ink-jet package does not appear the phenomenon of movement, to make the information of ink-jet clear, accurate and meet the specification, to facilitate traceability.