文章信息/Info

Title:

Roughening Design of Anti-Cracking Interface of Insulation Layer for Titanium�睩ire Retardant Coating

文章編號(hào):

1674-3962(2024)10-0935-09

作者:

王斯佳; 石秋生; 李廣榮; 劉梅軍; 楊冠軍

西安交通大學(xué)材料科學(xué)與工程學(xué)院 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):

WANG Sijia;  SHI Qiusheng;  LI Guangrong;  LIU Meijun;  YANG Guanjun

State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering,Xi’an Jiaotong University, Xi’an 710049, China

關(guān)鍵詞:

隔熱陶瓷層; 金屬基可磨耗封嚴(yán)涂層; 界面結(jié)合; 界面粗糙化; 抗開(kāi)裂設(shè)計(jì)

Keywords:

ceramic thermal insulation layer;  metal-based abradable seal layer;  interface adhesion;  interface roughening;  cracking-resistant design

分類(lèi)號(hào):

TG174.4

DOI:

10.7502/j.issn.1674-3962.202209031

文獻(xiàn)標(biāo)志碼:

A

摘要:

鈦合金在航空發(fā)動(dòng)機(jī)中應(yīng)用廣泛，但它們?cè)谟龅絼×覜_擊、摩擦等極端情況時(shí)易發(fā)生鈦火，繼而引起整臺(tái)發(fā)動(dòng)機(jī)著火，造成嚴(yán)重后果。在鈦合金表面涂覆阻燃涂層是目前解決鈦火問(wèn)題的主要方法之一。然而，阻燃涂層是由陶瓷隔熱層與金屬基可磨耗面層組成的多層復(fù)合結(jié)構(gòu)，在服役過(guò)程中，陶瓷/金屬異質(zhì)界面常發(fā)生剝落失效。基于此，主要開(kāi)展陶瓷隔熱層表面粗糙化設(shè)計(jì)，提升涂層抗開(kāi)裂能力。首先，為確定噴涂工藝對(duì)粉末熔化程度的影響規(guī)律，采用模擬與試驗(yàn)相結(jié)合的方法，研究了空心與實(shí)心兩種YSZ粉末粒子在等離子束流內(nèi)的加熱加速過(guò)程，明確了調(diào)控粉末熔化狀態(tài)的控制參數(shù)，試驗(yàn)沉積單個(gè)扁平粒子驗(yàn)證了模擬結(jié)果的合理性。其次，開(kāi)展了陶瓷隔熱層表面形貌調(diào)控研究。基于模擬結(jié)果，確定隔熱層主體應(yīng)采用高功率，以保證粉末充分熔化；表面粗化層采用較低功率以獲得半熔化態(tài)氧化鋯球殼，從而制備得到表面具有較大粗糙度、內(nèi)部具有良好隔熱防鈦火功能的新型隔熱層結(jié)構(gòu)。涂層表面的粗糙化設(shè)計(jì)，有利于提高金屬陶瓷的異質(zhì)界面結(jié)合強(qiáng)度，支撐涂層的長(zhǎng)壽命防護(hù)。

Abstract:

Titanium alloys are widely used in aero-engines. Titanium fire will occur under extreme situations, such as intense impact and friction, consequently causing fire all over the whole engine. An effective way to avoid the accident is to coat fire-resistant coatings on titanium alloy. This fire-resistant coating consists of a ceramic thermal insulation layer and a metal�瞓ased abradable seal layer.However, cracking may occur at the interface between the ceramic layer and the metal layer during service. Given that, this study aimed to enhance the crack resistance based on surface roughening design of the ceramic layer. Firstly, the heating and speeding processes of hollow and solid yttria�瞫tabilized zirconia (YSZ) powders in plasma beam was investigated by simulation and experiment, and the dominant parameters regulating powder melting state were obtained. The rationality of simulation results was verified by the deposition of individual splats. Furthermore, surface morphology of the ceramic thermal insulation layer was tailored. Based on the simulation results, the main part of the thermal insulation layer was prepared under a higher spraying power with fully melted powders. In contrast, the surface of the thermal insulation layer was deposited by a lower power with semi-molten powders. In this way, a thermal insulation layer can be prepared to both have high inside thermal insulation and large surface roughness. This is beneficial to improve the interface adhesion between the ceramic layer and the metal layer, which would support the long�瞝ife protection of coating.