低温温压工艺

Warm compaction at lower temperature

较系统地研究了低温温压工艺,考察了粉末温度、模具温度、润滑剂含量和压制压力对温压 密度的影响。实验结果表明:低温温压中最佳的模具温度、粉末温度分别为120℃和100℃;粉末 中最佳的润滑剂含量为0.65％;当压力为686 MPa时,Fe-1.5Cu-0.5C和Fe-1.5Ni-0.5Mo-0.5Cu- 0.5C(均为质量分数,％)材质体系的粉末压坯密度分别达到了7.42和7.41 g／cm3;2种粉末的温 压坯件经烧结后都发生了收缩,进一步提高了密度,合金Ni,Mo元素等具有优良的烧结强化效 果;采用低温温压工艺可以生产出烧结密度为7.34 g／cm3,烧结硬度为HRC 28,热处理后表观硬 度为HRC 54的高性能P／M齿轮。

The effects of powder temperature, die temperature, lubricant content and compacting pressure on the behavior of warm compaction at lower temperature were studied. The results show that the optimum die temperature and powder temperature are 120 and 100 ℃ , respectively. For Fe-1. 5Cu-0. 5C and Fe-1. 5Ni-0. 5Mo-0. 5Cu-0. 5C powders, the densities of 7. 42 and 7. 41 g/cm3 can be achieved at 686 MPa, respectively. Fe-1. 5Cu-0. 5C powders are more effective in warm compaction than Fe-1. 5Ni-0. 5Mo-0. 5Cu-0. 5C. For both powders, shrinkage takes place during sintering, which is beneficial to further increase density. High performance P/M gear with sintered density of 7. 34 g/cm3, sintered hardness of HRC 28 and heat treated surface hardness of HRC 54 can be produced through warm compaction at lower temperature. In a word, warm compaction at lower temperature will have a bright future because of the lower cost.