Forming low density molded article e.g. gear, by adding phenolic resin having binding agent to base material to form mixture, pressing mixture into pressed part using stamper, and solidifying agent by chemical reaction to form article

摘要

The method comprises adding phenolic resin containing binding agents to a base material to form a mixture, pressing the mixture at pressure of 5-150 MPa into a pressed part using stampers (2), and solidifying a binding agent of the pressed part by a chemical reaction to form a molded article. The chemical reaction includes adjusting pH of the binding agent by adding carbon dioxide. The method further comprises subjecting the article into a heat treatment to form a sintered article. The article is a porous article, has a density of 2.6-4 g/cm 3>. The method comprises adding phenolic resin containing binding agents to a base material to form a mixture, pressing the mixture at pressure of 5-150 MPa into a pressed part using stampers (2), and solidifying a binding agent of the pressed part by a chemical reaction to form a molded article. The chemical reaction includes adjusting pH of the binding agent by adding carbon dioxide. The method further comprises subjecting the article into a heat treatment to form a sintered article. The article is a porous article, and has a density of 2.6-4 g/cm 3>. The mixture contains 0.5-4 mass% of binding agents. The stampers extend in an axial direction. The article is produced with two material components having a material transition in a radial direction. The material components include a first and a base material.