Rare earth catalytic permeation QPQ composition and method for manufacturing high-speed cutting tool by QPQ process

Abstract

The invention discloses a rare earth catalytic permeation QPQ composition and a method for manufacturing a high-speed cutting tool by a QPQ process, and belongs to the metal surface treatment technology. A nitriding speed of a conventional QPQ process is relatively slow, the thickness of a nitrided layer formed on the surface of a metal is relatively small, the hardness of a corresponding depth is also relatively smaller, and the grain size of the nitrided layer is relatively low; the rare earth catalytic permeation QPQ composition contains a QPQ base salt, and a salt solution of the QPQ base salt contains CNO<->; the composition contains a rare earth compound as a catalytic permeation agent; the rare earth compound is a solid mixture of La carbonate and Ce carbonate according to the weight ratio of 1:3 to 3:1. The method comprises that the rare earth catalytic permeation QPQ composition is melted into a liquid state to become the salt solution, and a workpiece is immersed into the salt solution for nitridation. Compared with a conventional QPQ salt, the permeation rate is increased; the formed compound layer is 10 [mu]m or more deeper than a conventional QPQ compound layer, and the hardness of the corresponding depth is increased by 100 HV or more; the structure of the nitrided layer is increased by 1 grain size grade.

Description

technical field [0001] The invention belongs to metal surface treatment technology, in particular to a rare earth catalyzed permeation QPQ composition and a method for manufacturing high-speed cutting tools by QPQ technology. Background technique [0002] The nitriding speed of the existing QPQ process is slow, the thickness of the nitriding layer formed on the metal surface is small, the hardness at the corresponding depth is also small, and the grain size of the nitriding layer is low. Contents of the invention [0003] The technical problem to be solved and the technical task proposed by the present invention are to overcome the slow nitriding speed of the existing QPQ process, the thickness of the nitrided layer formed on the metal surface is small, the hardness at the corresponding depth is also small, and the crystallinity of the nitrided layer is relatively small. The invention provides a method for manufacturing a high-speed cutting tool with a rare earth catalyzed...

AI Technical Summary

Problems solved by technology

[0002] The nitriding speed of the existing QPQ process is slow, the thickness of the nitriding layer formed on the metal surface is small, the hardness at the corresponding depth is also small, and the grain size of the nitriding layer is low

Images