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Preparation method for active element sintered ZTA (Zirconia Toughened Alumina) particulate reinforced steel based compound grinding roller and grinding disk

A technology of particle reinforcement and active elements, which is applied in the field of wear-resistant materials preparation, can solve the problems of poor wettability and difficulty of high-performance composite materials, and achieve the effects of increasing depth, reducing casting defects, high production efficiency and yield

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 has the same problem as alumina, that is, it has poor wettability with molten iron, and it is very difficult to prepare high-performance composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Hammer type grinding roller

[0024] 1) Stir and mix the active metal element powder Ni with 10-20 mesh ZTA particles and binder, fill it into a graphite mold, pressurize it, and dry it;

[0025] Wherein, the massfraction that ZTA particle occupies in the mixture that mixed powder and ZTA particle forms is 75%;

[0026] The binder is a borax solution with a mass concentration of 20%, and the amount added is 3mL per 100g of the mixture;

[0027] 2) Put the mold and the mixture in it into the furnace for sintering, the heating rate is 5°C / min, heat from room temperature to 950°C for 1-2 hours, then cool at 4°C / min, when cooled to 900°C After cooling, ZTA particles are connected to each other through powder sintering products to form a strip-shaped porous prefabricated block with a porosity of 40-50%;

[0028] 3) Fix a plurality of porous prefabricated blocks on the end face side of the casting mold, that is, the working surface of the grinding roller, with...

Embodiment 2

[0029] Embodiment 2: tire type grinding roller

[0030] 1) Stir and mix the active metal element powder Cr with 10-20 mesh ZTA particles and binder, so that the active element powder is evenly coated on the surface of the ZTA particles, fill in the graphite mold, pressurize and dry;

[0031] Wherein, the massfraction that ZTA particle accounts for in the mixture that mixed powder and ZTA particle forms is 85%;

[0032] The binder is a borax solution with a mass concentration of 23%, and the amount added is 4mL per 100g of the mixture;

[0033] 2) Put the mold and the mixture in it into a vacuum sintering furnace for sintering, the heating rate is 8°C / min, heat up from room temperature to 1050°C for 1-2 hours, then cool at 6°C / min, when cooling to 900°C As the furnace cools, the ZTA particles are connected to each other through powder sintering products to form a strip-shaped porous prefabricated block with a porosity of 40-50%;

[0034] 3) Fix a plurality of porous prefabric...

Embodiment 3

[0035] Embodiment 3: grinding disc

[0036] 1) First, wet mix the active metal element powder Ni, Cr and absolute ethanol by ball mill to obtain the mixed powder;

[0037] 2) Next, stir and mix the mixed powder with 10-20 mesh ZTA particles and binder, so that the active element powder is uniformly coated on the surface of the ZTA particles, filled into a graphite mold, pressurized and dried;

[0038] Wherein, the massfraction that ZTA particle occupies in the mixture that mixed powder and ZTA particle forms is 80%;

[0039] The binder is a borax solution with a mass concentration of 25%, and its addition is 5 mL per 100 g of the mixture;

[0040] 3) Put the mold and the mixture in it into a vacuum sintering furnace for sintering, the heating rate is 10°C / min, heat from room temperature to 1000°C for 1-2 hours, and then cool at 5°C / min, when cooling to 900°C With the furnace cooling, the ZTA particles are connected to each other through powder sintering products to form a ho...

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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 grinding roller and a grinding disk. The preparation method comprises the following steps: 1) uniformly mixing multiple active element powder, and then adding a defined amount of binding agents and fully mixing with ZTA particulates so as to uniformly cover the active element powder on the surfaces of the particulates, filling into a graphite mould, pressing, and then drying; 2) sintering, thereby obtaining a porous precast block; 3) fixing the precast block on a specific casting position and pouring molten metal, cooling and de-molding, thereby obtaining the compound grinding roller or grinding disk. According to the preparation method, the shape and size of the ZTA particulate precast block can be controlled through the mould and the technique is simple and has higher production efficiency, yield and practicability. Besides, the active element introduced into the interface can increase the wettability and binding strength of the interface and a compound layer structure with interactive distributed enhanced phase and base can ensure the longer service life of the grinding roller and the grinding disk under high stress effect.

Description

technical field [0001] The invention belongs to the field of preparation of wear-resistant materials, and in particular relates to a method for preparing active element sintered ZTA particles reinforced steel-based composite grinding rollers and grinding discs suitable for vertical mills. Background technique [0002] The vertical mill is an important grinding equipment widely used in metallurgy, mining, cement, chemical industry and other industrial fields. Its principle is to use the relative movement and friction of the grinding roller and the grinding disc to grind the material into powder. During use, the grinding rollers and grinding discs will be subjected to comprehensive effects such as the reaction force of the material, grinding force, pressure exerted by the system, frictional resistance, impact force, etc. Therefore, the grinding rollers and grinding discs are the main wear and tear in the equipment and determine the service performance of the equipment. One of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/04B22F1/00C22C29/12
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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