Abstract: Disclosed is a splicing method for seamless butted laminated bamboo lumber (LBL), falling within the technical field of LBL. According to the present disclosure, positions needing to be spliced on end faces of bamboo materials are applied with glue adhesive, and butted by tenon-mortise structures, the tenon-mortise structure being at least one of a semicircle, a semi-ellipse, a V-shape and a U-shape. An included angle between a plane at a top of the V-shape and the end face of the bamboo material is greater than 14° when a single V-shape is adopted. According to the present disclosure, by butting the bamboo materials, products with any length, width and thickness can be produced, and the produced products are seamless, which improves the strength and stability of the products.

Abstract: Provided are a copper-containing, high-toughness and rapidly degradable magnesium alloy, a preparation method therefor and the use thereof, wherein same relate to the field of materials for oil and gas exploitation. When the magnesium alloy is in an as-cast state, an extrusion state or an aging state, a strengthening phase thereof mainly includes an Mg12CuRE-type long-period phase and an Mg5RE phase and an Mg2Cu phase, the Mg12CuRE-type long-period phase has a volume fraction of 3-60%, the Mg5RE phase has a volume fraction of 0.5-20%, and the Mg2Cu phase has a volume fraction of 0.5-15%, wherein RE is a rare-earth metal element.

Abstract: Provided are a copper-containing, high-toughness and rapidly degradable magnesium alloy, a preparation method therefor and the use thereof, wherein same relate to the field of materials for oil and gas exploitation. When the magnesium alloy is in an as-cast state, an extrusion state or an aging state, a strengthening phase thereof mainly includes an Mg12CuRE-type long-period phase and an Mg5RE phase and an Mg2Cu phase, the Mg12CuRE-type long-period phase has a volume fraction of 3-60%, the Mg5RE phase has a volume fraction of 0.5-20%, and the Mg2Cu phase has a volume fraction of 0.5-15%, wherein RE is a rare-earth metal element.

Abstract: The present disclosure provides a nickel-containing high-toughness controllably degradable magnesium alloy material, a preparation method therefor and use thereof, and relates to the technical field of magnesium alloys. The magnesium alloy material comprises the following components in percentage by mass: 0.3 to 8.5% of Ni, 0.5 to 28% of RE, with the balance being Mg and unavoidable impurities. RE represents rare earth elements. By adding Ni and RE elements to introduce an Mg12RENi-type long-period phase, an Mg2Ni phase and an MgxREy phase, the magnesium alloy material provided by the present disclosure significantly improves mechanical properties of the alloy material, the tensile strength being up to 510 MPa. At the same time, the presence of the Mg12RENi-type long-period phase and Mg2Ni phase enables the alloy material to be controllably degradable, and enables the degradation rate to be adjustable between 360 and 2400 mm/a.

Abstract: An apparently seamless lengthened bamboo sheet is formed by lengthening a plurality of bamboo strips or blanks and assembling a plurality of lengthened bamboo strips or blanks together. A slot is formed on at least one end of the bamboo strips or blanks in direction of length, and a tenon corresponding to the slot is formed on the same end; the tenon on one bamboo strip or blank is embedded into the slot on another bamboo strip or blank. The tenon and slot are mutually matched and the two bamboo strips or blanks are engaged to each other. A method to manufacture is the apparently seamless lengthened bamboo sheet includes: forming a slot and a tenon on the end of bamboo strips or blanks; embedding a tenon at one end of one bamboo strip or blank into a slot on one end of another bamboo strip or blank; assembling and gluing a plurality of lengthened bamboo strips or blanks in direction of width or thickness; forming the bamboo sheet by a common process including pressing.

Abstract: An apparently seamless lengthened bamboo sheet is formed by lengthening a plurality of bamboo strips or blanks and assembling a plurality of lengthened bamboo strips or blanks together. A slot is formed on at least one end of the bamboo strips or blanks in direction of length, and a tenon corresponding to the slot is formed on the same end; the tenon on one bamboo strip or blank is embedded into the slot on another bamboo strip or blank. The tenon and slot are mutually matched and the two bamboo strips or blanks are engaged to each other. A method to manufacture is the apparently seamless lengthened bamboo sheet includes: forming a slot and a tenon on the end of bamboo strips or blanks; embedding a tenon at one end of one bamboo strip or blank into a slot on one end of another bamboo strip or blank; assembling and gluing a plurality of lengthened bamboo strips or blanks in direction of width or thickness; forming the bamboo sheet by a common process including pressing.