Ancormix

ANCORMIX Technical Publications

173. Higher Green Strength Materials for Green Handling Proper handling of green components is of great importance to parts manufacturers. Damage to fragile compacts has the potential of being economically catastrophic in a production setting. To counteract this problem, a newly engineered lubricant system was developed that provides enhanced green strengths compared to traditional lubricants. AncorMix HGS, which is applicable to all iron-based compositions, is most effective when tooling temperatures are between 60 and 75 °C (140 and 165 °F) and requires no powder heating or curing. This manuscript reviews the enhancements in green strengths that are obtained using HGS compared to ethylene bisstearamide. Laboratory as well as production data are presented.

58. Higher Green Strength and Improved Density by Conventional Compaction A new material system that can produce very high green strength and green density has been developed for conventional compaction processing. The system, which uses a zincless lubricant, is based on the optimization of the bonding mechanism and binder chemistry. This approach permits the bonding of copper particles in a FC-0208 mix. Examples of the binder-treatment of FN-0208, Ancorstee1 45P, and Ancorstee150 HP are also included.

57. Application of High Performance Binder-Treated Materials Binder treated materials such as ANCORBOND^® and ANCORDENSE^® increase the performance characteristics of ferrous powder premixes and P/M parts. This paper will discuss the various characteristics of binder treated premixes and their potential applications. A review of the mechanical properties of ANCORDENSE materials will be presented.

51. Processing Experience of Green Strength Enhanced Material Systems Green strength enhanced material systems have been developed for iron and Low alloy as well as stainless powder metallurgy applications. Relative to normal processing, the increase in green strength is 50-100%. The nature of green strength with respect to both materials and processing conditions is reviewed. The processing variations designed to meet target properties such as apparent density, flow and compressibility are compared with conventional material systems. Manufacturing experience with a mechanical press is presented.

46. Recent Applications of Binder Treatment Technology The development of a practical binder treatment process in the late 1980's has since led to the commercialization of several new premix technologies that have had a major impact on P/M competitiveness. To date, a great deal has been written about these technologies. However, until now, there has been little to suggest that they are inherently interrelated by a common approach, or that this approach has untapped potential for still newer and better technologies. In addition, it also happens that in spite of all that has been written on the existing technologies, there is nothing that serves as a comprehensive single source of information on all of them. Consequently, the purpose of the present paper is to document the indicated approach as well as to present a summary description of each of the technologies complete with one or more production case histories of recent origin. The aim of the latter is to present discriminating up-to-date examples of general interest as well as to highlight one or more of the various advantages of the associated technology.

40. Enhanced Green Strength Material System for Ferrous and Stainless P/M Processing Strength limitations of green powder metallurgy compacts often present fabricators with processing problems. Increased part complexity, process automation and the need for reduced green scrap requires the P/M compact to attain higher green strength. Currently, several limitations restrict the ability to increase green strength in P/M compacts. Powder characteristics, such as particle size distribution and morphology, compressibility and common lubricant systems, all pose limitations on the compact green strength. Enhanced material systems improve the green strength of ferrous-based P/M parts by a minimum of 100% relative to compacts containing admixed lubricant. Process advantages, specific test results, and side effects of high green strength systems will be discussed.

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