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Sintered alumina-based ceramic and sintered alumina-based ceramic part
Sintered alumina-based ceramic and sintered alumina-based ceramic part
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机译:烧结氧化铝基陶瓷和烧结氧化铝基陶瓷零件
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摘要
A sintered alumina-based ceramic has a relative density of equal to or higher than 95%, an average grain size in a range of 10 - 25 µm and a fracture toughness Kc equal to or lower than 3.0 MPam1/2 Furthermore. In a machinability evaluation test using a surface grinder, the ceramic exhibits equal to or less than 310 W of increase in the load on a motor rotating a grinding wheel of the surface grinder. The machinability evaluation test is performed under the following condition.(1) The dimension of a test piece of the sintered alumina-based ceramic is larger than 15 mm in width, larger than 30 mm in length and larger than 10 mm in height.(2) The test piece is fixed on a table of said surface grinder and ground by the grinding wheel along a direction of its length.(3) The grinding wheel has a dimension of 10 mm in width and 200 mm in outer diameter, and consists of synthetic (or artificial) diamond abrasive grains more than 80 wt% of which are in a grain size range of 74 - 88 µm, and which are resin-bonded at 3.3 cts/cm3 of weight content per unit volume.(4) The circumferrential speed of said grinding wheel is 2400 m/min, the table traversing speed is 60 mm/min, and the infeed per traverse is 3 mm.
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机译:烧结氧化铝基陶瓷的相对密度为95%以上,平均粒径为10〜25μm,断裂韧性Kc为3.0MPam1 / 2以下。在使用平面磨床的可加工性评估测试中,陶瓷在旋转平面磨床的砂轮的电动机上的负载增加量等于或小于310W。切削性评价试验在以下条件下进行。(1)氧化铝烧结陶瓷试片的尺寸应大于15毫米,长度大于30毫米,高度大于10毫米。(2)固定在工作台上(3)砂轮的宽度为10毫米,外径为200毫米,并且由合成(或人造)金刚石磨料颗粒组成,大于其中80 wt%的晶粒尺寸在74-88 µm的范围内,并且以每单位体积重量含量3.3 cts / cm3的树脂结合。(4)所述砂轮的圆周速度为2400 m / min ,工作台运行速度为60 mm / min,每行进给量为3 mm。
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