Complexing agent for preparing tungsten carbide granule reinforced steel matrix skin layer composite material

Abstract

The invention discloses a preparation method for complexing agent to WCp reinforcing steel-base surface composite material, which comprises 15-30% thermosetting water-soluble phenolic resin and borax, 1-7% mixture of 300 item aluminum powder, 300 item high carbon ferro-chrome and 270 item ferro-molybdenum powder, and water. The product has well wettability with WC particle, proper binding strength, low foam quantity, little bad residue, and strong function to eliminate defect between metal body and particle, and sets base for casting-osmosis method to prepare the said composite material.

Description

technical field [0001] The invention belongs to a material used in the process of preparing composite materials, in particular to a composite agent for preparing tungsten carbide particles (WCp) reinforced steel-based surface layer composite materials. Background technique [0002] The casting infiltration process prepares WCp reinforced steel-based surface composite materials, which pre-fix the WC particles as the reinforcing phase at a specific position in the mold cavity, and then inject molten steel, which infiltrates the WC particles and penetrates into the gaps. , there is a certain degree of interfacial interaction, and finally a layer of WCp reinforced steel matrix composite material is formed on the surface of the casting. Typical processes are ordinary cast infiltration process and negative pressure cast infiltration process. In particular, the ordinary cast infiltration process has the advantages of simple process, less energy consumpti...

AI Technical Summary

Problems solved by technology

[0003] However, based on the above-mentioned existing preparation technologies, it is not difficult to find that there are still many deficiencies in the application of the casting infiltration process.

If the composite layer is not well bonded to the matrix, iron oxide impurities are accumulated on the interface; improper use of binders leads to uneven thickness of the composite layer, uneven surface, and defects such as pores and slag inclusions in the composite layer; prefabricated compacts must be equipped with corresponding Pressure forming equipment and molds prolong the production cycle and significantly increase the manufacturing cost of the product; it is difficult to prepare a cast-infiltrated composite layer with poor wettability between the reinforcing particles and the matrix material; the negative pressure cast-infiltrated process requires corresponding equipment, and the cost is high. Long production cycle, difficult to manufacture larger parts, etc.

There are two main reasons for the above deficiencies: 1) the viewpoint of pure binder, and improper selection of binder; 2) insufficient understanding of the metallurgical phenomena that occur at the interface between the particles and the matrix during the casting infiltration process In-depth, no measures are taken to eliminate the problem of iron oxide accumulation at the interface