Although most of the new PM applications require high density to withstand demanding loads, many parts are still produced in a density range of 6.0 to 6.6 g/cm3. For such applications, high green strength is a key factor to avoid green cracks during compaction and handling before sintering. These parts must also show good dimensional stability during sintering. A study has been carried out to evaluate the behaviour of various powder grades during sintering. F-0005 and FC-0205 mixes were prepared and pressed to a green density of 6.4 g/cm3. Sintered properties were evaluated and dimensional behaviour characterized by dilatometry. Also, compressibility and green strength were determined at 275, 480 and 690 MPa using a mix with 0.75% EBS wax. Results showed that with proper modification of particle morphology and particle size distribution, the dimensional change can be modified and the green strength improved.
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机译：尽管大多数新的PM应用需要高密度来承受苛刻的负载，但许多部件仍然在6.0至6.6g / cm3的密度范围内产生。对于此类应用，高绿色强度是避免在烧结之前压实和处理过程中的绿色裂缝的关键因素。这些部件还必须在烧结过程中显示良好的尺寸稳定性。已经进行了一项研究，以评估烧结过程中各种粉末等级的行为。制备F-0005和Fc-0205混合物并将其压在6.4g / cm 3的绿色密度。评估烧结性质和尺寸行为，其特征是稀释物。此外，使用0.75％EBS蜡的混合物在275,480和690MPa处测定可压缩性和绿色强度。结果表明，随着颗粒形态和粒度分布的适当修改，可以改变尺寸变化，绿色强度提高。
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