文章信息/Info

Title:

Research Progress of Metal Cr Coating on Zirconium Alloy Cladding in Water-Cooled Reactors

文章編號(hào):

1674-3962(2022)06-0445-13

作者:

肖珣; 王亞強(qiáng); 張金鈺; 吳凱; 劉剛; 孫軍

（西安交通大學(xué) 金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室，陜西 西安 710049）

Author(s):

XIAO Xun;  WANG Yaqiang;  ZHANG Jinyu;  WU Kai;  LIU Gang;  SUN Jun

(State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China)

關(guān)鍵詞:

鋯合金包殼; 表面技術(shù); 金屬Cr涂層; 制備方法; 微觀組織; 服役性能

Keywords:

zirconium alloy cladding;  surface technology;  metal Cr coating;  preparation;  microstructures;  service performance

分類號(hào):

TG144；TL352.2+2

DOI:

10.7502/j.issn.1674-3962.202103006

文獻(xiàn)標(biāo)志碼:

A

摘要:

鋯合金由于自身良好的力學(xué)性能、耐腐蝕性能和中子經(jīng)濟(jì)性，被廣泛應(yīng)用于水冷反應(yīng)堆核燃料包殼材料，然而在失水事故工況下鋯合金會(huì)與高溫水蒸氣劇烈反應(yīng)生成大量氫氣，進(jìn)而引發(fā)核事故。目前，提高鋯合金包殼服役性能的最有效途徑是在其表面制備一層防護(hù)涂層，其中，金屬Cr涂層具有優(yōu)異的抗高溫氧化、耐腐蝕性能以及良好的力學(xué)強(qiáng)度和襯底附著力，是一種最具發(fā)展?jié)摿Φ匿喓辖鸢鼩ね繉硬牧�。主要從制備工藝、微觀組織和服役性能3個(gè)方面，對(duì)鋯合金包殼表面金屬Cr涂層的研究現(xiàn)狀進(jìn)行了綜述。首先介紹了鋯合金包殼金屬Cr涂層的主要制備工藝技術(shù)，重點(diǎn)闡述了各制備工藝的特點(diǎn)及不足；其次總結(jié)了金屬Cr涂層的柱狀晶、等軸晶和無(wú)序非晶結(jié)構(gòu)，分析了3種微觀組織的結(jié)構(gòu)特征和生長(zhǎng)機(jī)制，以及制備工藝參數(shù)對(duì)組織形成的影響作用；然后闡述了鋯合金包殼金屬Cr涂層的力學(xué)性能、抗高溫氧化性能、耐腐蝕性能和抗輻照性能，并對(duì)其塑性變形機(jī)制、腐蝕氧化機(jī)理和輻照損傷機(jī)制進(jìn)行了深入剖析；最后對(duì)當(dāng)前研究中存在的問(wèn)題以及未來(lái)的發(fā)展方向進(jìn)行了分析和展望。

Abstract:

Zirconium alloy is widely used as nuclear fuel cladding materials for water-cooled reactors because of its good mechanical properties, corrosion resistance and neutron economy. However, it will react with high temperature steam with generating a large amount of hydrogen under the loss of coolant accident, thus leading to the nuclear accident. At present, the most effective way to improve the service performance of zirconium alloy cladding is to prepare a layer of protective coating on its surface. The metal Cr coating is one of the most potential materials for the zirconium alloy cladding, owing to its excellent high-temperature oxidation resistance, corrosion resistance, good mechanical strength and interfacial adhesion. In this paper, research status of the metal Cr coating on zirconium alloy cladding was reviewed from three aspects of preparation technology, microstructure and service performance. Firstly, the main preparation techniques of metal Cr coating were introduced, and the characteristics and shortcomings of each preparation method were emphasized. Secondly, the columnar crystal, equiaxed crystal and disordered amorphous structure of Cr coating were summarized. The structural characteristics and growth mechanisms of the three microstructures, as well as the effect of process parameters on the microstructures were analyzed. Moreover, the mechanical properties, high-temperature oxidation resistance, corrosion resistance and irradiation resistance of the metal Cr coating were elaborated, deeply analyzing the plastic deformation, corrosion, oxidation and irradiation damage mechanisms. Finally, the existed problems and the future development direction in the current research were analyzed and prospected.