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Preparation method for active element sintered ZTA (Zirconia Toughened Alumina) particulate reinforced steel based compound hammer

A technology of particle reinforcement and active elements, which is applied in the field of preparation of active element sintered ZTA particle-reinforced steel-based composite hammers, can solve the problems of poor wettability and difficulty of high-performance composite materials, and achieve good impact resistance and save consumption , The effect of high interface bonding strength

Inactive Publication Date: 2014-05-07
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZTA ceramics have the same problems as alumina, that is, poor wettability with molten iron, making it difficult to prepare high-performance composite materials

Method used

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  • Preparation method for active element sintered ZTA (Zirconia Toughened Alumina) particulate reinforced steel based compound hammer
  • Preparation method for active element sintered ZTA (Zirconia Toughened Alumina) particulate reinforced steel based compound hammer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) First, mix active metal element powders Ni and Cr with absolute ethanol by ball milling or mixing cylinder to obtain mixed powder;

[0027] 2) Next, mix the above-mentioned mixed powder with 10-20 mesh ZTA particles to obtain a mixture, then add a binder to the mixture, stir and mix, fill it into a honeycomb mold and press it, and then dry it at 70°C;

[0028] The mass fraction of ZTA particles in the mixture is 75%, the binder is a borax solution with a mass concentration of 20%, and 3 mL is added to every 100 g of the mixture;

[0029] 3) Put the mold into the furnace for sintering, heat up from room temperature to 950°C at a rate of 5°C / min for sintering for 2 hours, then cool at 4°C / min, and cool with the furnace when cooling to 900°C, and the ZTA particles are connected to each other Form a honeycomb prefabricated block with a porosity of 40%;

[0030] 4) Fix a plurality of honeycomb prefabricated blocks on the end face side of the mold at a distance of 15mm, t...

Embodiment 2

[0032] 1) Mix the active metal element powder Ni with 10-20 mesh ZTA particles to obtain a mixture, then add a binder to the mixture, stir and mix, fill it into a honeycomb mold, press it, and dry it at 70°C;

[0033] The mass fraction of ZTA particles in the mixture is 78%, and the binder is a borax solution with a mass concentration of 24%, adding 5mL per 100g of the mixture;

[0034] 2) Put the mold into a vacuum sintering furnace for sintering, heat up from room temperature to 1050°C at a rate of 6°C / min for sintering for 1 hour, then cool at 6°C / min, and cool with the furnace when cooled to 900°C, ZTA particles Interconnected to form a honeycomb prefabricated block with a porosity of 48%;

[0035] 3) Fix a plurality of honeycomb prefabricated blocks on the end face side of the mold at a distance of 25mm, that is, the working face or the striking face, and then pour the low-alloy steel molten metal with a casting infiltration process at a pouring temperature of 1450-1550°C...

Embodiment 3

[0037] 1) Mix the active metal element powder Cr with 10-20 mesh ZTA particles to obtain a mixture, then add a binder to the mixture, stir and mix, fill it into a honeycomb mold, press it, and dry it at 70°C;

[0038] The mass fraction of ZTA particles in the mixture is 70%, the binder is a borax solution with a mass concentration of 25%, and 5 mL is added to every 100 g of the mixture;

[0039] 2) Put the mold into a vacuum sintering furnace for sintering, heat up from room temperature to 1020°C at a rate of 9°C / min for sintering for 1.5 hours, then cool at 4°C / min, and cool with the furnace when cooled to 900°C, ZTA particles Interconnected to form a honeycomb prefabricated block with a porosity of 43%;

[0040] 3) Fix a plurality of honeycomb prefabricated blocks on the end face side of the casting mold at a distance of 30mm, that is, the working face or the striking face, and then pour the chromium-based alloy cast iron metal liquid through the casting infiltration process...

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Abstract

The invention discloses a preparation method for an active element sintered ZTA (Zirconia Toughened Alumina) particulate reinforced steel based compound hammer. The preparation method comprises the following steps: uniformly mixing active element powder; adding a defined amount of binding agents, mixing and stirring with ZTA particulates; filling into a honeycomb-shaped mould, pressing and then drying; sintering to obtain a honeycomb-shaped precast block; fixing the honeycomb-shaped precast block on a reserved casting position and pouring molten metal; cooling and de-molding, thereby obtaining a compound hammer. According to the preparation method, a sintering technique for the ZTA particulate precast block is simple; the shape and size of the precast block can be controlled through the mould; the casting seeping technique for the compound hammer has higher production efficiency, yield and universality. Besides, the active element introduced into the interface can increase the interface bonding strength and a compound layer structure with a pinning effect can endow the compound hammer with better impact resistance.

Description

technical field [0001] The invention belongs to the field of material preparation for crushing equipment, and in particular relates to a method for preparing an active element sintered ZTA particle-reinforced steel-based composite hammer suitable for a hammer crusher. Background technique [0002] Hammer crushers are widely used in metallurgy, mining and other industrial fields, and their hammer heads are key components that withstand major wear and impact. Currently commonly used hammer head materials include traditional steel materials such as high-chromium cast iron, alloy steel, and high-manganese steel. However, with the continuous improvement of crushing processing requirements, it is difficult for a single-material hammer head to perform well under severe working conditions. Performance, which promotes the development of new wear-resistant materials and the optimization of hammer head structure design. [0003] Ceramic particle-reinforced steel-based composites combi...

Claims

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Application Information

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IPC IPC(8): B22D23/04
Inventor 汤姝莉李烨飞高义民邢建东郑开宏孙良
Owner XI AN JIAOTONG UNIV
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