Preparation method of on-site synthesized TiB2+TiC two-phase particle-reinforced steel matrix surface wear-resistant extra hard steel and extra hard steel

A particle-enhanced and in-situ synthesis technology, applied in the field of superhard steel, can solve the problems of low density of local reinforced alloy layer, inability to manufacture local reinforced composite materials, etc. high effect

Inactive Publication Date: 2013-09-18
JIANGSU LANRI ULTRA HARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitation of this technology is that it is impossible to manufacture locally reinforced compos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 600g of titanium powder with a particle size of 20μm, 210g of boron carbide powder of 100μm, 100g of titanium carbide powder of 15μm, 50g of ferroboron powder of 150μm and 40g of borax, mix in a ball mill for 4 hours, and then add about 200ml of 5% polyvinyl alcohol aqueous solution , Stir in a mixer for 0.5h to make SHS powder paste. Coat the mixed SHS powder paste on the working surface of the hammerhead foam plastic model of the hammer crusher with a thickness of 5~10mm, and then hang about 1.5mm thick magnesia powder anti-sticking sand coating on the outside. Dry in an oven at no more than 50 oC for 12 hours before use, or fully dry in a natural environment.

[0036] Put the foamed plastic model of the hammer head of the hammer crusher coated with SHS powder paste and magnesia powder anti-sticking sand coating and the pouring system in a special sand box for vacuum lost foam, and fill it with dry quartz sand. Then place it on a vibrating table and vibrate it ...

Embodiment 2

[0039]Weigh 590 g of titanium powder with a particle size of 15 μm, 200 g of 100 μm boron carbide powder, 100 g of 10 μm titanium carbide powder, 65 g of 150 μm ferroboron powder and 45 g of borax, mix in a ball mill for 4 hours, then add about 200 ml of 5% polyvinyl alcohol aqueous solution, Stir in a mixer for 0.5h to make SHS powder paste. Press the mixed SHS powder paste into a paste block, stick it on the wear-resistant part of the excavator bucket tooth foam plastic model, the thickness of the paste block is 6mm, and then hang about 2mm thick quartz powder anti-sticking sand coating on the outside. Dry in an oven at no higher than 50 oC for 12 hours before use.

[0040] Put the excavator bucket tooth foam plastic model and pouring system coated with SHS powder and anti-sticking sand coating in the special sand box for vacuum lost foam, and fill it with dry quartz sand, and then place it on the vibrating table to vibrate tightly In practice, the upper part of the sand bo...

Embodiment 3

[0043] Weigh 240 g of titanium powder with a particle size of 10 μm, 80 g of boron carbide powder of 150 μm, 200 g of titanium carbide powder of 20 μm, 400 g of ferroboron powder of 180 μm and 80 g of borax, mix in a ball mill for 4 hours, then add about 200 ml of 5% polyvinyl alcohol aqueous solution, Stir in a mixer for 0.5h to make SHS powder paste. Press the mixed SHS powder paste into a paste block, stick it on the wear-resistant part of the excavator bucket tooth foam plastic model, the thickness of the paste block is 6mm, and then hang about 2mm thick quartz powder anti-sticking sand coating on the outside. Dry in an oven at no higher than 50 oC for 12 hours before use.

[0044] Put the excavator bucket tooth foam plastic model and pouring system coated with SHS powder and anti-sticking sand coating in the special sand box for vacuum lost foam, and fill it with dry quartz sand, and then place it on the vibrating table to vibrate tightly In practice, the upper part of t...

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Abstract

The invention discloses a preparation method of metal matrix surface wear-resistant extra hard steel and the extra hard steel, particularly relates to a preparation method of on-site synthesized TiB2+TiC two-phase particle-reinforced steel matrix surface wear-resistant extra hard steel through a combination of a lost foam casting technology and an SHS (Self-propagating High Temperature Synthesis) synthesis technology and the extra hard steel, and aims at reinforcing specific areas or positions of casting through on-site two-phase particles generated through reaction, thereby not only guaranteeing the tenacity of metal matrix, but also improving the high hardness and the wear-resisting property of service areas or positions. The method comprises the steps as follows: firstly, mixing titanium powder, boron carbide powder, fluxing agent, additive and binder according to predetermined ratio, so as to produce SHS powder paste; secondly, coating the produced SHS powder paste onto the surface of a foamed plastic model corresponding to wear-resisting positions of the casting; and lastly, pouring high-temperature molten steel through an LFC (Load Frequency Control) method lost foam casting technology, so as to induce the self-propagating synthesis reaction of SHS powder to generate TiB2+TiC hard particle reinforced phase, and to produce particle-reinforced steel matrix surface wear-resistant extra hard casting.

Description

technical field [0001] The present invention relates to the preparation method of metal-based surface wear-resistant superhard steel and superhard steel, in particular to the in-situ synthesis of TiB by combining the lost foam casting process and the SHS synthesis technology 2 +TiC dual-phase particle-reinforced steel-based surface wear-resistant superhard steel and a preparation method of the superhard steel. Background technique [0002] Particle-reinforced metal matrix composites have the advantages of good comprehensive performance, simple preparation process, low cost, suitable for overall and local composites, etc., and become one of the research hotspots in the field of composite materials. Among them, the in situ synthesis of TiB 2 +TiC dual-phase particle reinforced metal matrix composites have the advantages of high hardness, high melting point, low density, low resistivity, low friction coefficient and good conductivity, and due to the formation of chemical react...

Claims

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Application Information

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IPC IPC(8): B22D19/02B22D19/08B22C3/00B22C9/04
Inventor 不公告发明人
Owner JIANGSU LANRI ULTRA HARD MATERIAL
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