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橡胶及塑料挤出机(包括注塑机)的螺杆,我国多采用38CrMOAlA钢氮化处理,从而获得高耐磨性。但某些工况条件,经氮化处理后仍然满足不了技术要求。如挤出再生胶的氮化螺杆、挤出添加玻璃纤维填料(塑料)的氮化螺杆等。国外对这些耐磨螺杆,多采用表面全涂覆耐磨合金,或在不含铝的氮化钢螺杆齿顶部热喷涂耐磨合金,其余部份再氮化处理。国內曾有热喷涂耐磨合金的,但未见报道应用。82年我们在含铝38CrMoAlA钢进行了热喷涂镍基自熔合金及与多基材的对比试验,现予介绍。
Rubber and plastic extruder (including injection molding machine) screw, China more use of 38CrMOAlA steel nitriding, resulting in high wear resistance. However, some working conditions, after nitriding still can not meet the technical requirements. Such as extrusion reclaimed rubber nitriding screw extrusion, adding glass fiber filler (plastic) nitriding screw and so on. Abroad for these wear-resistant screw, the use of surface all-wear-resistant alloy, or in the top of non-aluminum nitride steel screw top thermal spray wear-resistant alloy, the rest of the nitriding. China had thermal spray-resistant alloy, but no reported application. 82 years we have carried out in the 38CrMoAlA steel thermal sprayed nickel-based self-fluxing alloy and multi-substrate comparative test, is introduced.