Gradient thermal barrier coating for auxiliary automobile cast aluminum cylinder body and preparation method thereof
A technology of thermal barrier coating and cast aluminum, applied in coating, metal material coating process, fusion spraying, etc., can solve extensive and in-depth problems, achieve sufficient thermal fatigue and mechanical strength, high wear resistance, high intensity effect
Inactive Publication Date: 2020-07-03
FUJIAN UNIV OF TECH
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[0002] ZrC has very good thermal conductivity and electrical conductivity, and its electrical conductivity is equivalent to that of metals. ZrC is suitable for many fields such as emitter shell coatings, nuclear fuel particle coatings, thermal photoelectric radiator coatings, and ultra-high temperature materials. Great application potential, but its research is not as extensive and in-depth as Ti(C,N) ceramics
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[0022] A gradient thermal barrier coating for an auxiliary automotive cast aluminum cylinder body, comprising a base layer, a first transition layer, a second transition layer and a surface layer arranged sequentially from bottom to top, each layer comprising the following components in weight percentage:
[0023] Surface layer: ZrSiC alloy powder;
[0024] Second transition layer: 30% NiMoSi 2 Alloy powder, 70% ZrSiC alloy powder;
[0025] First transition layer: 60% NiMoSi 2 Alloy powder, 40% ZrSiC alloy powder;
[0026] Base layer: NiMoSi 2 alloy powder.
[0027] The NiMoSi 2 The alloy powder includes the following components in weight percentage: 70-80% MoSi 2 And 20-30% Ni, such a ratio makes the coating wet and spread, establishes the chemical compatibility between the coating and the metal, and can relieve the residual stress.
[0028] In the surface layer, the ZrSiC alloy powder includes the following components in weight percentage: 70% SiC and 30% ZrC; such a ...
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Abstract
The invention provides an auxiliary automotive cast aluminum cylinder block gradient thermal barrier coating and a preparation method thereof. The coating comprises a substrate layer, a first transition layer, a second transition layer and a surface layer which are sequentially arranged from bottom to top. The preparation method includes the steps as follows: pretreatment is performed on the innersurface of the automotive cast aluminum cylinder block; the substrate layer is arranged on the inner surface of the cast aluminum cylinder block through powder spraying by the aid of high-speed flames in advance, and then the substrate layer is obtained through laser cladding; and the first transition layer, the second transition layer and the surface layer are prepared in the same manner. The ZrSiC surface coating has the high strength, the creep resistance, the high bending strength, the excellent oxidation resistance, the good corrosion resistance, the high abrasion resistance, the low friction coefficient, the sufficient thermal fatigue and the sufficient mechanical strength.
Description
【Technical field】 [0001] The invention specifically relates to a gradient thermal barrier coating for an auxiliary automobile cast aluminum cylinder body and a preparation method thereof. 【Background technique】 [0002] ZrC has very good thermal conductivity and electrical conductivity, and its electrical conductivity is equivalent to that of metals. ZrC is suitable for many fields such as emitter shell coatings, nuclear fuel particle coatings, thermal photoelectric radiator coatings, and ultra-high temperature materials. It has great application potential, but its research is not as extensive and in-depth as Ti(C,N) ceramics. ZrC has good radiation resistance and is a good substitute material for the traditional coating of SiC coating on fuel particles. SiC (silicon carbide) has stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance. In addition to being used as an abrasive, SiC has many other uses, such as: coa...
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IPC IPC(8): C23C4/10C23C4/06C23C4/129C23C24/10C23C4/18
CPCC23C4/06C23C4/10C23C4/129C23C24/10C23C24/103
Inventor 简明德王乾廷刘成武
Owner FUJIAN UNIV OF TECH