Self toughening silion nitride ceramic guide and guard roller and its preparing method

A technology of toughened silicon nitride and guide rollers, which is applied in the field of self-toughened silicon nitride ceramic guide rollers and its preparation, which can solve the problems of frequent replacement, failure of guide rollers due to high-temperature wear, and material consumption of guide rollers.

Inactive Publication Date: 2006-06-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above factors lead to huge material consumption of guide rollers and frequent replacement of guide devices, which has become one of the bottlenecks restricting the normal production of wire rods.
[0004] At present, most of the guide rollers are made of heat-resistant steel and other metal materials. Due to the low hardness and wear resistance of metals at high temperatures, and poor chemical stability at hi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of β-Si 3 N 4 Seed crystal: Add 100 grams of ytterbium oxide to 900 grams of α-phase silicon nitride powder fine powder, put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, and absolute ethanol as the mixing medium, powder, The mass ratio of grinding balls and ethanol is 1:1.5:2. After ball milling for 24 hours, dry in a double-cone rotary vacuum dryer. Put the powder into a graphite crucible, heat at 1550°C for 3 hours in a nitrogen atmosphere, grind the powder, and pass through a 200-mesh sieve to obtain β-Si 3 N 4 Seed.

[0024] 2) Mixing: Add 300 grams of ytterbium oxide and 100 grams of prefabricated β-Si to 600 grams of raw material α-phase silicon nitride fine powder 3 N 4 Seed. Put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, acetone as the mixing medium, and the mass ratio of powder, balls and acetone is 1:1.5:2. After ball milling for 12 hours, dry in a doub...

Embodiment 2

[0030] 1) Preparation of β-Si 3 N 4 Seed crystal: Add 150 grams of ytterbium oxide to 850 grams of α-phase silicon nitride powder fine powder, put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, and acetone as the mixing medium, powder, milling balls The mass ratio to ethanol is 1:1.5:2. After ball milling for 24 hours, dry in a double-cone rotary vacuum dryer. Put the powder into a graphite crucible, heat at 1650°C for 1 hour in a nitrogen atmosphere, grind the powder, and pass through a 200-mesh sieve to obtain β-Si 3 N 4 Seed.

[0031] 2) Mixing: Add 200 grams of ytterbium oxide and 80 grams of prefabricated β-Si to 720 grams of raw material α-phase silicon nitride fine powder 3 N 4 Seed. Put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, acetone as the mixing medium, and the mass ratio of powder, balls and ethanol is 1:1.5:2. After ball milling for 24 hours, dry in a double-cone rotary v...

Embodiment 3

[0037] 1) Preparation of β-Si 3 N 4Seed crystal: Add 150 grams of ytterbium oxide to 850 grams of α-phase silicon nitride powder fine powder, put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, and absolute ethanol as the mixing medium, powder, The mass ratio of grinding balls and ethanol is 1:1.5:2. After ball milling for 24 hours, dry in a double-cone rotary vacuum dryer. Put the powder into a graphite crucible, heat at 1750°C for 0.5 hours in a nitrogen atmosphere, grind the powder, and pass through a 200-mesh sieve to obtain β-Si 3 N 4 Seed.

[0038] 2) Mixing: Add 100 grams of ytterbium oxide and 50 grams of prefabricated β-Si to 850 grams of raw material α-phase silicon nitride fine powder 3 N 4 Seed. Put the powder into a stirring mill, use silicon nitride balls as the ball milling medium, absolute ethanol as the mixed medium, and the mass ratio of the powder, the balls and the ethanol is 1:1.5:2. After ball milling for 40 ...

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Abstract

The present invention belongs to the field of ceramic material preparing technology, and features that the guide and guard roller is made of material comprising alpha-phase silicon nitride powder 55-85 wt%, ytterbium oxide 10-30 wt% and prefabricated beta-phase silicon nitride crystal seed 5-15 wt%. The making process of the guide and guard roller includes the following steps: mixing alpha-phase silicon nitride powder, beta-phase silicon nitride crystal seed and ytterbium oxide in the weight proportion, ball milling, drying, pelletizing, forming and sintering to obtain guide and guard roller blank, and final finish grinding. The guide and guard roller product has high toughness, high strength, high hardness, high wear resistance, service life as long as 7-8 times that of guide and guard roller of heat resistant steel and greatly raised work efficiency of high speed wire rolling machine.

Description

technical field [0001] The invention relates to a self-toughening silicon nitride ceramic guide roller for high-speed wire rolling and a preparation method thereof, belonging to the technical field of ceramic material preparation. Background technique [0002] The guide device is an important part of the section steel main rolling mill. Its main function is to guide the rolled piece to bite in and out smoothly along the correct route, to straighten the bent rolled piece, and to clamp and straighten the rolled piece. The guide roller is the most critical part in the guide device, which plays a decisive role in realizing the function of the guide device. [0003] During the wire rolling process, the steel billet passes through the guide device at a relatively high temperature (900-1250°C) and at a high speed (above 50m / s). Cooling water with a certain pressure is sprayed on the surface. Therefore, at a relatively high temperature, the guide device not only has to withstand r...

Claims

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Application Information

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IPC IPC(8): C04B35/584B21B39/14C04B35/622
Inventor 杨晓战李建保
Owner TSINGHUA UNIV
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