In situ self-generated graphene on the surface of ductile iron components induced by laser compounding
A ductile iron, in-situ self-generating technology, used in laser welding equipment, manufacturing tools, welding equipment, etc., to achieve the effect of simple method, reduced wear amount, and reduced temperature gradient
Active Publication Date: 2018-12-14
JIANGSU UNIV
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a method for using laser composite induction of in-situ self-generated graphene on the surface of ductile iron to solve the problem that the friction pair components of ductile iron usually need to take into account the friction and wear performance and heat dissipation performance. In-situ self-generated graphene can significantly improve the friction and wear performance and service life of the surface of the component while solving the problem of heat dissipation on the surface of the component
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0032] The ductile iron component is an automobile brake disc, and the base material is QT500. The specific implementation steps are as follows:
[0033] A) Clean the QT500 ductile iron automobile brake disc sample, and clean and dry the surface, use 30μm thick black paint and 3mm thick water as the absorption layer and the constraint layer respectively.
[0034] B) Using a Nd:YAG nanosecond pulsed laser with a pulse frequency of 10Hz, a laser energy of 1.5J, and a spot diameter of 2mm, a Gaussian beam is used to prepare a bionic shape of a circular pit on the surface of the brake disc, along the diameter of the brake disc. , the distance between the centers of two adjacent circular pits is 2 mm, and the rotation angle around the axis is 15 。 , use the computer control system to set the feed path of the five-axis CNC motion platform, and perform laser shot peening on the surface of the brake disc to prepare the bionic shape of the circular pit, and induce dislocation prolifera...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| friction coefficient | aaaaa | aaaaa |
| friction coefficient | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a method for laser composite induction of in-situ authigenic graphene on the surface of a spherical graphite cast iron component in the field of material surface modification. The surface of the spherical graphite cast iron component is covered with an absorption layer and a restraint layer and is subjected to laser peening through a laser, and bionic morphology is prepared on the surface of the component; the surface of the component is subjected to laser irradiation through the optical fiber laser, the power density of laser irradiation is 20-30 W / mm<2>, the scanning speed is 2-30 mm / s, the overlapping rate is 20-60%, and spherical graphite in the component is peeled off and forms the in-situ authigenic graphene on the surface of the component; on the one hand, surface roughness of a contact interface is adjusted through the bionic morphology, and the elastic modulus and shearing strength of the surface of spherical graphite cast iron are remarkably increased by combining grain refinement and dislocation multiplication in the deformation strengthening process; and on the other hand, through the excellent heat conduction property of the base authigenic graphene, heat conduction is accelerated, heat radiation is enhanced, the temperature gradient of the contact interface is reduced, and thus, hot fatigue resistance of the component is effectively improved.
Description
technical field [0001] The invention belongs to the technical field of material surface modification, in particular to a method for modifying the surface of a nodular cast iron component, especially a nodular cast iron friction pair component, to improve the friction and wear performance and service life of the surface of the nodular cast iron friction pair component. Background technique [0002] Due to its good wear resistance, shock absorption, excellent cutting performance and casting performance, ductile iron is widely used in friction pair components in machinery, especially vehicles, such as camshafts, piston rings, cylinder blocks / covers, Brake discs, etc. According to different working conditions (dry friction, wet friction) of ductile iron components, the contact interface of the components needs to provide high or low friction coefficient and have good anti-wear performance. Moreover, due to the cyclic loading of mechanical stress and frictional heat generation d...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/352B23K26/12B23K26/18C21D5/00C21D10/00
CPCB23K26/123B23K26/18B23K26/352C21D5/00C21D10/005
Inventor 冯旭周建忠周依阳徐家乐李京孙瑜培陆宇豪
Owner JIANGSU UNIV