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High toughness iron-based powder metallurgy valve seat

An iron-based powder metallurgy and valve seat technology, applied in metal processing equipment, lift valves, mechanical equipment, etc., can solve problems such as the impact of engine performance and vehicle quality, the decline of engine power, and the reduction of valve seat life, and achieve excellent mechanics. Performance and stability, the effect of reducing porosity, improving wear resistance

Active Publication Date: 2018-08-31
南通鸿明新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the Pb, S and other substances released by leaded gasoline when it burns interact with metals to easily produce high-temperature corrosion candles, damage the valve seat, and pollute the environment, so leaded gasoline has basically been discontinued.
In this way, the valve seat will have no lead compound to act as a lubricant during the work process, thereby reducing the service life of the valve seat during use, which will easily cause problems such as "valve sinking" or even failure, causing the engine to The power of the engine will be seriously reduced, and the performance of the engine and the quality of the vehicle will be seriously affected.

Method used

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  • High toughness iron-based powder metallurgy valve seat

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Comparison scheme
Effect test

Embodiment 1

[0015] A high-toughness iron-based powder metallurgy valve seat, made of the following raw materials in mass percentage: 1.9% graphite, 1.46% chromium powder, 4.7% cobalt powder, 1.69% aluminum powder, 1.61% silicon powder, zirconium powder 0.6% niobium powder, 1.38% niobium powder, 0.13% hafnium powder, 4.3% auxiliary agent, and the balance is iron powder; the auxiliary agent is made of the following raw materials in mass percentage: 66% lubricant, 17% Nanoscale titanium dioxide and 17% zinc oxide, the lubricant is nickel-coated molybdenum disulfide, and the graphite is flake graphite with a particle size of 55-75 μm.

[0016] Considering the impact of raw material particle size on powder metallurgy materials, the iron powder is atomized iron powder with a particle size of 100-130 μm, chromium powder, cobalt powder, aluminum powder, silicon powder, zirconium powder, niobium powder and hafnium powder. The diameter is 75-100μm.

[0017] The preparation method of above-mentione...

Embodiment 2

[0027]A high-toughness iron-based powder metallurgy valve seat, made of the following raw materials in mass percentage: graphite 1.7%, chromium powder 1.5%, cobalt powder 4.8%, aluminum powder 1.6%, silicon powder 1.56%, zirconium 0.4% niobium powder, 1.3% niobium powder, 0.21% hafnium powder, 4.0% auxiliary agent, and the balance is iron powder; the auxiliary agent is made of the following raw materials in mass percentage: 60% lubricant, 20% Nanoscale titanium dioxide and 20% zinc oxide, the lubricant is nickel-coated molybdenum disulfide, the graphite is flake graphite with a particle size of 55-75 μm, and the iron powder is atomized with a particle size of 100-130 μm The particle diameters of iron powder, chromium powder, cobalt powder, aluminum powder, silicon powder, zirconium powder, niobium powder and hafnium powder are all 75-100 μm.

[0028] The preparation method of above-mentioned valve seat comprises the following steps:

[0029] Step 1, raw material preparation, ...

Embodiment 3

[0038] A high-toughness iron-based powder metallurgy valve seat, made of the following raw materials in mass percentage: 2.2% graphite, 1.4% chromium powder, 4.5% cobalt powder, 1.8% aluminum powder, 1.77% silicon powder, zirconium 0.6% niobium powder, 1.36% niobium powder, 0.18% hafnium powder, 4.8% auxiliary agent, and the balance is iron powder; the auxiliary agent is made of the following raw materials in mass percentage: 65% lubricant, 18% Nanoscale titanium dioxide and 17% zinc oxide, the lubricant is nickel-coated molybdenum disulfide, the graphite is flake graphite with a particle size of 55-75 μm, and the iron powder is atomized with a particle size of 100-130 μm The particle diameters of iron powder, chromium powder, cobalt powder, aluminum powder, silicon powder, zirconium powder, niobium powder and hafnium powder are all 75-100 μm.

[0039] The preparation method of above-mentioned valve seat comprises the following steps:

[0040] Step 1, raw material preparation...

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Abstract

The invention discloses a high-toughness iron-based powder metallurgy valve seat, which is made of the following raw materials in mass percentage: 1.7-2.6% of graphite, 1.4-1.5% of chromium powder, 4.5-4.8% of cobalt powder and 4.5-4.8% of aluminum powder 1.6‑1.8%, 1.56‑1.77% for silicon powder, 0.4‑0.7% for zirconium powder, 1.3‑1.41% for niobium powder, 0.13‑0.21% for hafnium powder, 4.0‑5.0% for additives, and the balance is iron powder . The iron-based powder metallurgy valve seat of the present invention not only ensures good corrosion resistance, high temperature resistance and wear resistance, but also has excellent mechanical properties and stability, so that the iron-based powder metallurgy valve seat has good alloy properties and stable structure performance, preventing brittle fracture of the valve seat due to high hardness.

Description

technical field [0001] The invention relates to the field of engine component manufacturing, in particular to a high-toughness iron-based powder metallurgy valve seat. Background technique [0002] The valve seat is an important part of the automobile engine. In the valve train of the engine, the valve seat and the valve work together to seal the cylinder. With the rapid development of automobiles, the valve seat is subjected to a variety of forces (mechanical impact, high-temperature gas scour and rotten candles, dust wear, alternating cold and heat stress) during work, and it is very easy to produce shape changes and high-temperature burns. even break. When the traditional heat-resistant steel or special alloy cast iron valve seat is used, the lead-containing compound produced by P and S in the combustion gas will be attached to the outer surface of the valve seat when burning lead gasoline, so as to lubricate and reduce friction role. However, because the Pb, S and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C38/18C22C38/10C22C38/06C22C38/02C22C38/14C22C38/12C22C32/00F01L3/02
CPCF01L3/02C22C32/001C22C38/02C22C38/06C22C38/10C22C38/12C22C38/14C22C38/18B22F1/105
Inventor 张荣斌
Owner 南通鸿明新材料有限公司
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