HEXAMETHYLENETETRAMINE LEVELS EFFECT OVER THE YOUNG'S MODULUS IN ABRASIVE MATERIALS

Author(s)

Amaral, Emanuelle Machado ; Schweiger, Raphael ; Bottairi, Freitas ; Gandolpho Candioto, Katia Cristiane ; ASME

• Document type: Journal article
• Source: PROCEEDINGS OF THE ASME 2020 15TH INTERNATIONAL MANUFACTURING SCIENCE AND ENGINEERING CONFERENCE (MSEC2020), VOL 2A; v. N/A, p. 4-pg., 2020-01-01.

Abstract

Abrasive composites are very important, since they are widely used in industrial machining processes, responsible for both fine and rough grinding of the work material. For this reason, there is great interest in the research of materials for abrasive wheels, since advances in this area are restricted to the industries, without disclosure to the academic community. This study aims to compare the Young's modulus and the Impact strength of the produced materials, parameter that can be related to the material's hardness, thus defining its applicability. The abrasive materials produced are defined by a structure containing 46% vol. of aluminum oxide grain (mesh #46), 22% vol. of phenolic resin binders with different levels of hexamethylenetetramine (14.55% and 8.97%), curing agent responsible for the crosslinking of the resins and 32% vol. of pores. The materials were mixed and pressed at room temperature, and the curing process happened at 60 degrees C/6h, 80 degrees C/8h and 160 degrees C/4h. The Young's modulus were determined by non-destructive testing using the impulse excitation technique and the results obtained were compared to those obtained by the dynamic mechanical analysis. The abrasive composite materials produced from the mixture with higher hexamethylenetetramine content presented greater Young's modulus and greater rigidity as demonstrated by the impact strength too, which should be associated with the influence of its content in the composition. The use of a resin with a higher content of this agent for the production of abrasive wheels will result in a higher stress tool compared to tools that do not use excess hexamethylenetetramine. (AU)

• FAPESP's process: 14/18967-8 - Processing and determination of the dynamic mechanical thermal properties of phenolic resins abrasives materials for grinding wheels
• Grantee: Raphael Schweiger Freitas Bottairi
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/26633-0 - Study in abrasive manufactory technology
• Grantee: Katia Cristiane Gandolpho Candioto
• Support Opportunities: Regular Research Grants